psmouse-base.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 917 行 · 第 1/2 页

/*
 * PS/2 mouse driver
 *
 * Copyright (c) 1999-2002 Vojtech Pavlik
 */

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */

#include <linux/delay.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/init.h>
#include "psmouse.h"
#include "synaptics.h"
#include "logips2pp.h"

#define DRIVER_DESC	"PS/2 mouse driver"

MODULE_AUTHOR("Vojtech Pavlik <[e-mail]>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

static char *psmouse_proto;
static unsigned int psmouse_max_proto = -1U;
module_param_named(proto, psmouse_proto, charp, 0);
MODULE_PARM_DESC(proto, "Highest protocol extension to probe (bare, imps, exps). Useful for KVM switches.");

int psmouse_resolution = 200;
module_param_named(resolution, psmouse_resolution, uint, 0);
MODULE_PARM_DESC(resolution, "Resolution, in dpi.");

unsigned int psmouse_rate = 100;
module_param_named(rate, psmouse_rate, uint, 0);
MODULE_PARM_DESC(rate, "Report rate, in reports per second.");

int psmouse_smartscroll = 1;
module_param_named(smartscroll, psmouse_smartscroll, bool, 0);
MODULE_PARM_DESC(smartscroll, "Logitech Smartscroll autorepeat, 1 = enabled (default), 0 = disabled.");

static unsigned int psmouse_resetafter;
module_param_named(resetafter, psmouse_resetafter, uint, 0);
MODULE_PARM_DESC(resetafter, "Reset device after so many bad packets (0 = never).");

__obsolete_setup("psmouse_noext");
__obsolete_setup("psmouse_resolution=");
__obsolete_setup("psmouse_smartscroll=");
__obsolete_setup("psmouse_resetafter=");
__obsolete_setup("psmouse_rate=");

static char *psmouse_protocols[] = { "None", "PS/2", "PS2++", "PS2T++", "GenPS/2", "ImPS/2", "ImExPS/2", "SynPS/2"};

/*
 * psmouse_process_byte() analyzes the PS/2 data stream and reports
 * relevant events to the input module once full packet has arrived.
 */

static psmouse_ret_t psmouse_process_byte(struct psmouse *psmouse, struct pt_regs *regs)
{
	struct input_dev *dev = &psmouse->dev;
	unsigned char *packet = psmouse->packet;

	if (psmouse->pktcnt < 3 + (psmouse->type >= PSMOUSE_GENPS))
		return PSMOUSE_GOOD_DATA;

/*
 * Full packet accumulated, process it
 */

	input_regs(dev, regs);

/*
 * The PS2++ protocol is a little bit complex
 */

	if (psmouse->type == PSMOUSE_PS2PP || psmouse->type == PSMOUSE_PS2TPP)
		ps2pp_process_packet(psmouse);

/*
 * Scroll wheel on IntelliMice, scroll buttons on NetMice
 */

	if (psmouse->type == PSMOUSE_IMPS || psmouse->type == PSMOUSE_GENPS)
		input_report_rel(dev, REL_WHEEL, -(signed char) packet[3]);

/*
 * Scroll wheel and buttons on IntelliMouse Explorer
 */

	if (psmouse->type == PSMOUSE_IMEX) {
		input_report_rel(dev, REL_WHEEL, (int) (packet[3] & 8) - (int) (packet[3] & 7));
		input_report_key(dev, BTN_SIDE, (packet[3] >> 4) & 1);
		input_report_key(dev, BTN_EXTRA, (packet[3] >> 5) & 1);
	}

/*
 * Extra buttons on Genius NewNet 3D
 */

	if (psmouse->type == PSMOUSE_GENPS) {
		input_report_key(dev, BTN_SIDE, (packet[0] >> 6) & 1);
		input_report_key(dev, BTN_EXTRA, (packet[0] >> 7) & 1);
	}

/*
 * Generic PS/2 Mouse
 */

	input_report_key(dev, BTN_LEFT,    packet[0]       & 1);
	input_report_key(dev, BTN_MIDDLE, (packet[0] >> 2) & 1);
	input_report_key(dev, BTN_RIGHT,  (packet[0] >> 1) & 1);

	input_report_rel(dev, REL_X, packet[1] ? (int) packet[1] - (int) ((packet[0] << 4) & 0x100) : 0);
	input_report_rel(dev, REL_Y, packet[2] ? (int) ((packet[0] << 3) & 0x100) - (int) packet[2] : 0);

	input_sync(dev);

	return PSMOUSE_FULL_PACKET;
}

/*
 * psmouse_interrupt() handles incoming characters, either gathering them into
 * packets or passing them to the command routine as command output.
 */

static irqreturn_t psmouse_interrupt(struct serio *serio,
		unsigned char data, unsigned int flags, struct pt_regs *regs)
{
	struct psmouse *psmouse = serio->private;
	psmouse_ret_t rc;

	if (psmouse->state == PSMOUSE_IGNORE)
		goto out;

	if (flags & (SERIO_PARITY|SERIO_TIMEOUT)) {
		if (psmouse->state == PSMOUSE_ACTIVATED)
			printk(KERN_WARNING "psmouse.c: bad data from KBC -%s%s\n",
				flags & SERIO_TIMEOUT ? " timeout" : "",
				flags & SERIO_PARITY ? " bad parity" : "");
		psmouse->nak = 1;
		clear_bit(PSMOUSE_FLAG_ACK, &psmouse->flags);
		clear_bit(PSMOUSE_FLAG_CMD,  &psmouse->flags);
		wake_up_interruptible(&psmouse->wait);
		goto out;
	}

	if (test_bit(PSMOUSE_FLAG_ACK, &psmouse->flags)) {
		switch (data) {
			case PSMOUSE_RET_ACK:
				psmouse->nak = 0;
				break;

			case PSMOUSE_RET_NAK:
				psmouse->nak = 1;
				break;

			/*
			 * Workaround for mice which don't ACK the Get ID command.
			 * These are valid mouse IDs that we recognize.
			 */
			case 0x00:
			case 0x03:
			case 0x04:
				if (test_bit(PSMOUSE_FLAG_WAITID, &psmouse->flags)) {
					psmouse->nak = 0;
					break;
				}
				/* Fall through */
			default:
				goto out;
		}

		if (!psmouse->nak && psmouse->cmdcnt) {
			set_bit(PSMOUSE_FLAG_CMD, &psmouse->flags);
			set_bit(PSMOUSE_FLAG_CMD1, &psmouse->flags);
		}
		clear_bit(PSMOUSE_FLAG_ACK, &psmouse->flags);
		wake_up_interruptible(&psmouse->wait);

		if (data == PSMOUSE_RET_ACK || data == PSMOUSE_RET_NAK)
			goto out;
	}

	if (test_bit(PSMOUSE_FLAG_CMD, &psmouse->flags)) {
		if (psmouse->cmdcnt)
			psmouse->cmdbuf[--psmouse->cmdcnt] = data;

		if (test_and_clear_bit(PSMOUSE_FLAG_CMD1, &psmouse->flags) && psmouse->cmdcnt)
			wake_up_interruptible(&psmouse->wait);

		if (!psmouse->cmdcnt) {
			clear_bit(PSMOUSE_FLAG_CMD, &psmouse->flags);
			wake_up_interruptible(&psmouse->wait);
		}
		goto out;
	}

	if (psmouse->state == PSMOUSE_INITIALIZING)
		goto out;

	if (psmouse->state == PSMOUSE_ACTIVATED &&
	    psmouse->pktcnt && time_after(jiffies, psmouse->last + HZ/2)) {
		printk(KERN_WARNING "psmouse.c: %s at %s lost synchronization, throwing %d bytes away.\n",
		       psmouse->name, psmouse->phys, psmouse->pktcnt);
		psmouse->pktcnt = 0;
	}

	psmouse->last = jiffies;
	psmouse->packet[psmouse->pktcnt++] = data;

	if (psmouse->packet[0] == PSMOUSE_RET_BAT) {
		if (psmouse->pktcnt == 1)
			goto out;

		if (psmouse->pktcnt == 2) {
			if (psmouse->packet[1] == PSMOUSE_RET_ID) {
				psmouse->state = PSMOUSE_IGNORE;
				serio_reconnect(serio);
				goto out;
			}
			if (psmouse->type == PSMOUSE_SYNAPTICS) {
				/* neither 0xAA nor 0x00 are valid first bytes
				 * for a packet in absolute mode
				 */
				psmouse->pktcnt = 0;
				goto out;
			}
		}
	}

	rc = psmouse->protocol_handler(psmouse, regs);

	switch (rc) {
		case PSMOUSE_BAD_DATA:
			printk(KERN_WARNING "psmouse.c: %s at %s lost sync at byte %d\n",
				psmouse->name, psmouse->phys, psmouse->pktcnt);
			psmouse->pktcnt = 0;

			if (++psmouse->out_of_sync == psmouse_resetafter) {
				psmouse->state = PSMOUSE_IGNORE;
				printk(KERN_NOTICE "psmouse.c: issuing reconnect request\n");
				serio_reconnect(psmouse->serio);
			}
			break;

		case PSMOUSE_FULL_PACKET:
			psmouse->pktcnt = 0;
			if (psmouse->out_of_sync) {
				psmouse->out_of_sync = 0;
				printk(KERN_NOTICE "psmouse.c: %s at %s - driver resynched.\n",
					psmouse->name, psmouse->phys);
			}
			break;

		case PSMOUSE_GOOD_DATA:
			break;
	}
out:
	return IRQ_HANDLED;
}

/*
 * psmouse_sendbyte() sends a byte to the mouse, and waits for acknowledge.
 * It doesn't handle retransmission, though it could - because when there would
 * be need for retransmissions, the mouse has to be replaced anyway.
 *
 * psmouse_sendbyte() can only be called from a process context
 */

static int psmouse_sendbyte(struct psmouse *psmouse, unsigned char byte)
{
	psmouse->nak = 1;
	set_bit(PSMOUSE_FLAG_ACK, &psmouse->flags);

	if (serio_write(psmouse->serio, byte) == 0)
		wait_event_interruptible_timeout(psmouse->wait,
				!test_bit(PSMOUSE_FLAG_ACK, &psmouse->flags),
				msecs_to_jiffies(200));

	clear_bit(PSMOUSE_FLAG_ACK, &psmouse->flags);
	return -psmouse->nak;
}

/*
 * psmouse_command() sends a command and its parameters to the mouse,
 * then waits for the response and puts it in the param array.
 *
 * psmouse_command() can only be called from a process context
 */

int psmouse_command(struct psmouse *psmouse, unsigned char *param, int command)
{
	int timeout;
	int send = (command >> 12) & 0xf;
	int receive = (command >> 8) & 0xf;
	int rc = -1;
	int i;

	timeout = msecs_to_jiffies(command == PSMOUSE_CMD_RESET_BAT ? 4000 : 500);

	clear_bit(PSMOUSE_FLAG_CMD, &psmouse->flags);
	if (command == PSMOUSE_CMD_GETID)
		set_bit(PSMOUSE_FLAG_WAITID, &psmouse->flags);

	if (receive && param)
		for (i = 0; i < receive; i++)
			psmouse->cmdbuf[(receive - 1) - i] = param[i];

	psmouse->cmdcnt = receive;

	if (command & 0xff)
		if (psmouse_sendbyte(psmouse, command & 0xff))
			goto out;

	for (i = 0; i < send; i++)
		if (psmouse_sendbyte(psmouse, param[i]))
			goto out;

	timeout = wait_event_interruptible_timeout(psmouse->wait,
				!test_bit(PSMOUSE_FLAG_CMD1, &psmouse->flags), timeout);

	if (psmouse->cmdcnt && timeout > 0) {
		if (command == PSMOUSE_CMD_RESET_BAT && jiffies_to_msecs(timeout) > 100)
			timeout = msecs_to_jiffies(100);

		if (command == PSMOUSE_CMD_GETID &&
		    psmouse->cmdbuf[receive - 1] != 0xab && psmouse->cmdbuf[receive - 1] != 0xac) {
			/*
			 * Device behind the port is not a keyboard
			 * so we don't need to wait for the 2nd byte
			 * of ID response.
			 */
			clear_bit(PSMOUSE_FLAG_CMD, &psmouse->flags);
			psmouse->cmdcnt = 0;
		}

		wait_event_interruptible_timeout(psmouse->wait,
				!test_bit(PSMOUSE_FLAG_CMD, &psmouse->flags), timeout);
	}

	if (param)
		for (i = 0; i < receive; i++)
			param[i] = psmouse->cmdbuf[(receive - 1) - i];

	if (psmouse->cmdcnt && (command != PSMOUSE_CMD_RESET_BAT || psmouse->cmdcnt != 1))
		goto out;

	rc = 0;

out:
	clear_bit(PSMOUSE_FLAG_CMD, &psmouse->flags);
	clear_bit(PSMOUSE_FLAG_CMD1, &psmouse->flags);
	clear_bit(PSMOUSE_FLAG_WAITID, &psmouse->flags);
	return rc;
}

/*
 * psmouse_sliced_command() sends an extended PS/2 command to the mouse
 * using sliced syntax, understood by advanced devices, such as Logitech
 * or Synaptics touchpads. The command is encoded as:
 * 0xE6 0xE8 rr 0xE8 ss 0xE8 tt 0xE8 uu where (rr*64)+(ss*16)+(tt*4)+uu
 * is the command.
 */
int psmouse_sliced_command(struct psmouse *psmouse, unsigned char command)
{
	int i;

	if (psmouse_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11))
		return -1;

	for (i = 6; i >= 0; i -= 2) {
		unsigned char d = (command >> i) & 3;
		if (psmouse_command(psmouse, &d, PSMOUSE_CMD_SETRES))
			return -1;
	}

	return 0;
}


/*
 * psmouse_reset() resets the mouse into power-on state.
 */
int psmouse_reset(struct psmouse *psmouse)
{
	unsigned char param[2];

	if (psmouse_command(psmouse, param, PSMOUSE_CMD_RESET_BAT))
		return -1;

	if (param[0] != PSMOUSE_RET_BAT && param[1] != PSMOUSE_RET_ID)
		return -1;

	return 0;
}


/*
 * Genius NetMouse magic init.
 */
static int genius_detect(struct psmouse *psmouse)
{
	unsigned char param[4];

	param[0] = 3;
	psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
	psmouse_command(psmouse,  NULL, PSMOUSE_CMD_SETSCALE11);
	psmouse_command(psmouse,  NULL, PSMOUSE_CMD_SETSCALE11);
	psmouse_command(psmouse,  NULL, PSMOUSE_CMD_SETSCALE11);
	psmouse_command(psmouse, param, PSMOUSE_CMD_GETINFO);

	return param[0] == 0x00 && param[1] == 0x33 && param[2] == 0x55;
}

/*
 * IntelliMouse magic init.
 */
static int intellimouse_detect(struct psmouse *psmouse)
{
	unsigned char param[2];

	param[0] = 200;
	psmouse_command(psmouse, param, PSMOUSE_CMD_SETRATE);
	param[0] = 100;
	psmouse_command(psmouse, param, PSMOUSE_CMD_SETRATE);
	param[0] =  80;
	psmouse_command(psmouse, param, PSMOUSE_CMD_SETRATE);
	psmouse_command(psmouse, param, PSMOUSE_CMD_GETID);

	return param[0] == 3;
}

/*
 * Try IntelliMouse/Explorer magic init.
 */
static int im_explorer_detect(struct psmouse *psmouse)
{
	unsigned char param[2];

	intellimouse_detect(psmouse);

	param[0] = 200;
	psmouse_command(psmouse, param, PSMOUSE_CMD_SETRATE);
	param[0] = 200;
	psmouse_command(psmouse, param, PSMOUSE_CMD_SETRATE);
	param[0] =  80;
	psmouse_command(psmouse, param, PSMOUSE_CMD_SETRATE);
	psmouse_command(psmouse, param, PSMOUSE_CMD_GETID);

	return param[0] == 4;
}