diff options
Diffstat (limited to 'drivers/input/mouse/vsxxxaa.c')
| -rw-r--r-- | drivers/input/mouse/vsxxxaa.c | 535 |
1 files changed, 535 insertions, 0 deletions
diff --git a/drivers/input/mouse/vsxxxaa.c b/drivers/input/mouse/vsxxxaa.c new file mode 100644 index 000000000..8af8e4a15 --- /dev/null +++ b/drivers/input/mouse/vsxxxaa.c @@ -0,0 +1,535 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Driver for DEC VSXXX-AA mouse (hockey-puck mouse, ball or two rollers) + * DEC VSXXX-GA mouse (rectangular mouse, with ball) + * DEC VSXXX-AB tablet (digitizer with hair cross or stylus) + * + * Copyright (C) 2003-2004 by Jan-Benedict Glaw <jbglaw@lug-owl.de> + * + * The packet format was initially taken from a patch to GPM which is (C) 2001 + * by Karsten Merker <merker@linuxtag.org> + * and Maciej W. Rozycki <macro@ds2.pg.gda.pl> + * Later on, I had access to the device's documentation (referenced below). + */ + +/* + * Building an adaptor to DE9 / DB25 RS232 + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * DISCLAIMER: Use this description AT YOUR OWN RISK! I'll not pay for + * anything if you break your mouse, your computer or whatever! + * + * In theory, this mouse is a simple RS232 device. In practice, it has got + * a quite uncommon plug and the requirement to additionally get a power + * supply at +5V and -12V. + * + * If you look at the socket/jack (_not_ at the plug), we use this pin + * numbering: + * _______ + * / 7 6 5 \ + * | 4 --- 3 | + * \ 2 1 / + * ------- + * + * DEC socket DE9 DB25 Note + * 1 (GND) 5 7 - + * 2 (RxD) 2 3 - + * 3 (TxD) 3 2 - + * 4 (-12V) - - Somewhere from the PSU. At ATX, it's + * the thin blue wire at pin 12 of the + * ATX power connector. Only required for + * VSXXX-AA/-GA mice. + * 5 (+5V) - - PSU (red wires of ATX power connector + * on pin 4, 6, 19 or 20) or HDD power + * connector (also red wire). + * 6 (+12V) - - HDD power connector, yellow wire. Only + * required for VSXXX-AB digitizer. + * 7 (dev. avail.) - - The mouse shorts this one to pin 1. + * This way, the host computer can detect + * the mouse. To use it with the adaptor, + * simply don't connect this pin. + * + * So to get a working adaptor, you need to connect the mouse with three + * wires to a RS232 port and two or three additional wires for +5V, +12V and + * -12V to the PSU. + * + * Flow specification for the link is 4800, 8o1. + * + * The mice and tablet are described in "VCB02 Video Subsystem - Technical + * Manual", DEC EK-104AA-TM-001. You'll find it at MANX, a search engine + * specific for DEC documentation. Try + * http://www.vt100.net/manx/details?pn=EK-104AA-TM-001;id=21;cp=1 + */ + +#include <linux/delay.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/input.h> +#include <linux/serio.h> + +#define DRIVER_DESC "Driver for DEC VSXXX-AA and -GA mice and VSXXX-AB tablet" + +MODULE_AUTHOR("Jan-Benedict Glaw <jbglaw@lug-owl.de>"); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); + +#undef VSXXXAA_DEBUG +#ifdef VSXXXAA_DEBUG +#define DBG(x...) printk(x) +#else +#define DBG(x...) do {} while (0) +#endif + +#define VSXXXAA_INTRO_MASK 0x80 +#define VSXXXAA_INTRO_HEAD 0x80 +#define IS_HDR_BYTE(x) \ + (((x) & VSXXXAA_INTRO_MASK) == VSXXXAA_INTRO_HEAD) + +#define VSXXXAA_PACKET_MASK 0xe0 +#define VSXXXAA_PACKET_REL 0x80 +#define VSXXXAA_PACKET_ABS 0xc0 +#define VSXXXAA_PACKET_POR 0xa0 +#define MATCH_PACKET_TYPE(data, type) \ + (((data) & VSXXXAA_PACKET_MASK) == (type)) + + + +struct vsxxxaa { + struct input_dev *dev; + struct serio *serio; +#define BUFLEN 15 /* At least 5 is needed for a full tablet packet */ + unsigned char buf[BUFLEN]; + unsigned char count; + unsigned char version; + unsigned char country; + unsigned char type; + char name[64]; + char phys[32]; +}; + +static void vsxxxaa_drop_bytes(struct vsxxxaa *mouse, int num) +{ + if (num >= mouse->count) { + mouse->count = 0; + } else { + memmove(mouse->buf, mouse->buf + num, BUFLEN - num); + mouse->count -= num; + } +} + +static void vsxxxaa_queue_byte(struct vsxxxaa *mouse, unsigned char byte) +{ + if (mouse->count == BUFLEN) { + printk(KERN_ERR "%s on %s: Dropping a byte of full buffer.\n", + mouse->name, mouse->phys); + vsxxxaa_drop_bytes(mouse, 1); + } + + DBG(KERN_INFO "Queueing byte 0x%02x\n", byte); + + mouse->buf[mouse->count++] = byte; +} + +static void vsxxxaa_detection_done(struct vsxxxaa *mouse) +{ + switch (mouse->type) { + case 0x02: + strscpy(mouse->name, "DEC VSXXX-AA/-GA mouse", + sizeof(mouse->name)); + break; + + case 0x04: + strscpy(mouse->name, "DEC VSXXX-AB digitizer", + sizeof(mouse->name)); + break; + + default: + snprintf(mouse->name, sizeof(mouse->name), + "unknown DEC pointer device (type = 0x%02x)", + mouse->type); + break; + } + + printk(KERN_INFO + "Found %s version 0x%02x from country 0x%02x on port %s\n", + mouse->name, mouse->version, mouse->country, mouse->phys); +} + +/* + * Returns number of bytes to be dropped, 0 if packet is okay. + */ +static int vsxxxaa_check_packet(struct vsxxxaa *mouse, int packet_len) +{ + int i; + + /* First byte must be a header byte */ + if (!IS_HDR_BYTE(mouse->buf[0])) { + DBG("vsck: len=%d, 1st=0x%02x\n", packet_len, mouse->buf[0]); + return 1; + } + + /* Check all following bytes */ + for (i = 1; i < packet_len; i++) { + if (IS_HDR_BYTE(mouse->buf[i])) { + printk(KERN_ERR + "Need to drop %d bytes of a broken packet.\n", + i - 1); + DBG(KERN_INFO "check: len=%d, b[%d]=0x%02x\n", + packet_len, i, mouse->buf[i]); + return i - 1; + } + } + + return 0; +} + +static inline int vsxxxaa_smells_like_packet(struct vsxxxaa *mouse, + unsigned char type, size_t len) +{ + return mouse->count >= len && MATCH_PACKET_TYPE(mouse->buf[0], type); +} + +static void vsxxxaa_handle_REL_packet(struct vsxxxaa *mouse) +{ + struct input_dev *dev = mouse->dev; + unsigned char *buf = mouse->buf; + int left, middle, right; + int dx, dy; + + /* + * Check for normal stream packets. This is three bytes, + * with the first byte's 3 MSB set to 100. + * + * [0]: 1 0 0 SignX SignY Left Middle Right + * [1]: 0 dx dx dx dx dx dx dx + * [2]: 0 dy dy dy dy dy dy dy + */ + + /* + * Low 7 bit of byte 1 are abs(dx), bit 7 is + * 0, bit 4 of byte 0 is direction. + */ + dx = buf[1] & 0x7f; + dx *= ((buf[0] >> 4) & 0x01) ? 1 : -1; + + /* + * Low 7 bit of byte 2 are abs(dy), bit 7 is + * 0, bit 3 of byte 0 is direction. + */ + dy = buf[2] & 0x7f; + dy *= ((buf[0] >> 3) & 0x01) ? -1 : 1; + + /* + * Get button state. It's the low three bits + * (for three buttons) of byte 0. + */ + left = buf[0] & 0x04; + middle = buf[0] & 0x02; + right = buf[0] & 0x01; + + vsxxxaa_drop_bytes(mouse, 3); + + DBG(KERN_INFO "%s on %s: dx=%d, dy=%d, buttons=%s%s%s\n", + mouse->name, mouse->phys, dx, dy, + left ? "L" : "l", middle ? "M" : "m", right ? "R" : "r"); + + /* + * Report what we've found so far... + */ + input_report_key(dev, BTN_LEFT, left); + input_report_key(dev, BTN_MIDDLE, middle); + input_report_key(dev, BTN_RIGHT, right); + input_report_key(dev, BTN_TOUCH, 0); + input_report_rel(dev, REL_X, dx); + input_report_rel(dev, REL_Y, dy); + input_sync(dev); +} + +static void vsxxxaa_handle_ABS_packet(struct vsxxxaa *mouse) +{ + struct input_dev *dev = mouse->dev; + unsigned char *buf = mouse->buf; + int left, middle, right, touch; + int x, y; + + /* + * Tablet position / button packet + * + * [0]: 1 1 0 B4 B3 B2 B1 Pr + * [1]: 0 0 X5 X4 X3 X2 X1 X0 + * [2]: 0 0 X11 X10 X9 X8 X7 X6 + * [3]: 0 0 Y5 Y4 Y3 Y2 Y1 Y0 + * [4]: 0 0 Y11 Y10 Y9 Y8 Y7 Y6 + */ + + /* + * Get X/Y position. Y axis needs to be inverted since VSXXX-AB + * counts down->top while monitor counts top->bottom. + */ + x = ((buf[2] & 0x3f) << 6) | (buf[1] & 0x3f); + y = ((buf[4] & 0x3f) << 6) | (buf[3] & 0x3f); + y = 1023 - y; + + /* + * Get button state. It's bits <4..1> of byte 0. + */ + left = buf[0] & 0x02; + middle = buf[0] & 0x04; + right = buf[0] & 0x08; + touch = buf[0] & 0x10; + + vsxxxaa_drop_bytes(mouse, 5); + + DBG(KERN_INFO "%s on %s: x=%d, y=%d, buttons=%s%s%s%s\n", + mouse->name, mouse->phys, x, y, + left ? "L" : "l", middle ? "M" : "m", + right ? "R" : "r", touch ? "T" : "t"); + + /* + * Report what we've found so far... + */ + input_report_key(dev, BTN_LEFT, left); + input_report_key(dev, BTN_MIDDLE, middle); + input_report_key(dev, BTN_RIGHT, right); + input_report_key(dev, BTN_TOUCH, touch); + input_report_abs(dev, ABS_X, x); + input_report_abs(dev, ABS_Y, y); + input_sync(dev); +} + +static void vsxxxaa_handle_POR_packet(struct vsxxxaa *mouse) +{ + struct input_dev *dev = mouse->dev; + unsigned char *buf = mouse->buf; + int left, middle, right; + unsigned char error; + + /* + * Check for Power-On-Reset packets. These are sent out + * after plugging the mouse in, or when explicitly + * requested by sending 'T'. + * + * [0]: 1 0 1 0 R3 R2 R1 R0 + * [1]: 0 M2 M1 M0 D3 D2 D1 D0 + * [2]: 0 E6 E5 E4 E3 E2 E1 E0 + * [3]: 0 0 0 0 0 Left Middle Right + * + * M: manufacturer location code + * R: revision code + * E: Error code. If it's in the range of 0x00..0x1f, only some + * minor problem occurred. Errors >= 0x20 are considered bad + * and the device may not work properly... + * D: <0010> == mouse, <0100> == tablet + */ + + mouse->version = buf[0] & 0x0f; + mouse->country = (buf[1] >> 4) & 0x07; + mouse->type = buf[1] & 0x0f; + error = buf[2] & 0x7f; + + /* + * Get button state. It's the low three bits + * (for three buttons) of byte 0. Maybe even the bit <3> + * has some meaning if a tablet is attached. + */ + left = buf[0] & 0x04; + middle = buf[0] & 0x02; + right = buf[0] & 0x01; + + vsxxxaa_drop_bytes(mouse, 4); + vsxxxaa_detection_done(mouse); + + if (error <= 0x1f) { + /* No (serious) error. Report buttons */ + input_report_key(dev, BTN_LEFT, left); + input_report_key(dev, BTN_MIDDLE, middle); + input_report_key(dev, BTN_RIGHT, right); + input_report_key(dev, BTN_TOUCH, 0); + input_sync(dev); + + if (error != 0) + printk(KERN_INFO "Your %s on %s reports error=0x%02x\n", + mouse->name, mouse->phys, error); + + } + + /* + * If the mouse was hot-plugged, we need to force differential mode + * now... However, give it a second to recover from it's reset. + */ + printk(KERN_NOTICE + "%s on %s: Forcing standard packet format, " + "incremental streaming mode and 72 samples/sec\n", + mouse->name, mouse->phys); + serio_write(mouse->serio, 'S'); /* Standard format */ + mdelay(50); + serio_write(mouse->serio, 'R'); /* Incremental */ + mdelay(50); + serio_write(mouse->serio, 'L'); /* 72 samples/sec */ +} + +static void vsxxxaa_parse_buffer(struct vsxxxaa *mouse) +{ + unsigned char *buf = mouse->buf; + int stray_bytes; + + /* + * Parse buffer to death... + */ + do { + /* + * Out of sync? Throw away what we don't understand. Each + * packet starts with a byte whose bit 7 is set. Unhandled + * packets (ie. which we don't know about or simply b0rk3d + * data...) will get shifted out of the buffer after some + * activity on the mouse. + */ + while (mouse->count > 0 && !IS_HDR_BYTE(buf[0])) { + printk(KERN_ERR "%s on %s: Dropping a byte to regain " + "sync with mouse data stream...\n", + mouse->name, mouse->phys); + vsxxxaa_drop_bytes(mouse, 1); + } + + /* + * Check for packets we know about. + */ + + if (vsxxxaa_smells_like_packet(mouse, VSXXXAA_PACKET_REL, 3)) { + /* Check for broken packet */ + stray_bytes = vsxxxaa_check_packet(mouse, 3); + if (!stray_bytes) + vsxxxaa_handle_REL_packet(mouse); + + } else if (vsxxxaa_smells_like_packet(mouse, + VSXXXAA_PACKET_ABS, 5)) { + /* Check for broken packet */ + stray_bytes = vsxxxaa_check_packet(mouse, 5); + if (!stray_bytes) + vsxxxaa_handle_ABS_packet(mouse); + + } else if (vsxxxaa_smells_like_packet(mouse, + VSXXXAA_PACKET_POR, 4)) { + /* Check for broken packet */ + stray_bytes = vsxxxaa_check_packet(mouse, 4); + if (!stray_bytes) + vsxxxaa_handle_POR_packet(mouse); + + } else { + break; /* No REL, ABS or POR packet found */ + } + + if (stray_bytes > 0) { + printk(KERN_ERR "Dropping %d bytes now...\n", + stray_bytes); + vsxxxaa_drop_bytes(mouse, stray_bytes); + } + + } while (1); +} + +static irqreturn_t vsxxxaa_interrupt(struct serio *serio, + unsigned char data, unsigned int flags) +{ + struct vsxxxaa *mouse = serio_get_drvdata(serio); + + vsxxxaa_queue_byte(mouse, data); + vsxxxaa_parse_buffer(mouse); + + return IRQ_HANDLED; +} + +static void vsxxxaa_disconnect(struct serio *serio) +{ + struct vsxxxaa *mouse = serio_get_drvdata(serio); + + serio_close(serio); + serio_set_drvdata(serio, NULL); + input_unregister_device(mouse->dev); + kfree(mouse); +} + +static int vsxxxaa_connect(struct serio *serio, struct serio_driver *drv) +{ + struct vsxxxaa *mouse; + struct input_dev *input_dev; + int err = -ENOMEM; + + mouse = kzalloc(sizeof(struct vsxxxaa), GFP_KERNEL); + input_dev = input_allocate_device(); + if (!mouse || !input_dev) + goto fail1; + + mouse->dev = input_dev; + mouse->serio = serio; + strlcat(mouse->name, "DEC VSXXX-AA/-GA mouse or VSXXX-AB digitizer", + sizeof(mouse->name)); + snprintf(mouse->phys, sizeof(mouse->phys), "%s/input0", serio->phys); + + input_dev->name = mouse->name; + input_dev->phys = mouse->phys; + input_dev->id.bustype = BUS_RS232; + input_dev->dev.parent = &serio->dev; + + __set_bit(EV_KEY, input_dev->evbit); /* We have buttons */ + __set_bit(EV_REL, input_dev->evbit); + __set_bit(EV_ABS, input_dev->evbit); + __set_bit(BTN_LEFT, input_dev->keybit); /* We have 3 buttons */ + __set_bit(BTN_MIDDLE, input_dev->keybit); + __set_bit(BTN_RIGHT, input_dev->keybit); + __set_bit(BTN_TOUCH, input_dev->keybit); /* ...and Tablet */ + __set_bit(REL_X, input_dev->relbit); + __set_bit(REL_Y, input_dev->relbit); + input_set_abs_params(input_dev, ABS_X, 0, 1023, 0, 0); + input_set_abs_params(input_dev, ABS_Y, 0, 1023, 0, 0); + + serio_set_drvdata(serio, mouse); + + err = serio_open(serio, drv); + if (err) + goto fail2; + + /* + * Request selftest. Standard packet format and differential + * mode will be requested after the device ID'ed successfully. + */ + serio_write(serio, 'T'); /* Test */ + + err = input_register_device(input_dev); + if (err) + goto fail3; + + return 0; + + fail3: serio_close(serio); + fail2: serio_set_drvdata(serio, NULL); + fail1: input_free_device(input_dev); + kfree(mouse); + return err; +} + +static struct serio_device_id vsxxaa_serio_ids[] = { + { + .type = SERIO_RS232, + .proto = SERIO_VSXXXAA, + .id = SERIO_ANY, + .extra = SERIO_ANY, + }, + { 0 } +}; + +MODULE_DEVICE_TABLE(serio, vsxxaa_serio_ids); + +static struct serio_driver vsxxxaa_drv = { + .driver = { + .name = "vsxxxaa", + }, + .description = DRIVER_DESC, + .id_table = vsxxaa_serio_ids, + .connect = vsxxxaa_connect, + .interrupt = vsxxxaa_interrupt, + .disconnect = vsxxxaa_disconnect, +}; + +module_serio_driver(vsxxxaa_drv); |