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android_kernel_xiaomi_sm8350/drivers/input/mouse/psmouse-base.c
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00

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/*
* PS/2 mouse driver
*
* Copyright (c) 1999-2002 Vojtech Pavlik
* Copyright (c) 2003-2004 Dmitry Torokhov
*/
/*
* 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 <linux/libps2.h>
#include <linux/mutex.h>
#include "psmouse.h"
#include "synaptics.h"
#include "logips2pp.h"
#include "alps.h"
#include "lifebook.h"
#include "trackpoint.h"
#define DRIVER_DESC "PS/2 mouse driver"
MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
static unsigned int psmouse_max_proto = PSMOUSE_AUTO;
static int psmouse_set_maxproto(const char *val, struct kernel_param *kp);
static int psmouse_get_maxproto(char *buffer, struct kernel_param *kp);
#define param_check_proto_abbrev(name, p) __param_check(name, p, unsigned int)
#define param_set_proto_abbrev psmouse_set_maxproto
#define param_get_proto_abbrev psmouse_get_maxproto
module_param_named(proto, psmouse_max_proto, proto_abbrev, 0644);
MODULE_PARM_DESC(proto, "Highest protocol extension to probe (bare, imps, exps, any). Useful for KVM switches.");
static unsigned int psmouse_resolution = 200;
module_param_named(resolution, psmouse_resolution, uint, 0644);
MODULE_PARM_DESC(resolution, "Resolution, in dpi.");
static unsigned int psmouse_rate = 100;
module_param_named(rate, psmouse_rate, uint, 0644);
MODULE_PARM_DESC(rate, "Report rate, in reports per second.");
static unsigned int psmouse_smartscroll = 1;
module_param_named(smartscroll, psmouse_smartscroll, bool, 0644);
MODULE_PARM_DESC(smartscroll, "Logitech Smartscroll autorepeat, 1 = enabled (default), 0 = disabled.");
static unsigned int psmouse_resetafter = 5;
module_param_named(resetafter, psmouse_resetafter, uint, 0644);
MODULE_PARM_DESC(resetafter, "Reset device after so many bad packets (0 = never).");
static unsigned int psmouse_resync_time;
module_param_named(resync_time, psmouse_resync_time, uint, 0644);
MODULE_PARM_DESC(resync_time, "How long can mouse stay idle before forcing resync (in seconds, 0 = never).");
PSMOUSE_DEFINE_ATTR(protocol, S_IWUSR | S_IRUGO,
NULL,
psmouse_attr_show_protocol, psmouse_attr_set_protocol);
PSMOUSE_DEFINE_ATTR(rate, S_IWUSR | S_IRUGO,
(void *) offsetof(struct psmouse, rate),
psmouse_show_int_attr, psmouse_attr_set_rate);
PSMOUSE_DEFINE_ATTR(resolution, S_IWUSR | S_IRUGO,
(void *) offsetof(struct psmouse, resolution),
psmouse_show_int_attr, psmouse_attr_set_resolution);
PSMOUSE_DEFINE_ATTR(resetafter, S_IWUSR | S_IRUGO,
(void *) offsetof(struct psmouse, resetafter),
psmouse_show_int_attr, psmouse_set_int_attr);
PSMOUSE_DEFINE_ATTR(resync_time, S_IWUSR | S_IRUGO,
(void *) offsetof(struct psmouse, resync_time),
psmouse_show_int_attr, psmouse_set_int_attr);
static struct attribute *psmouse_attributes[] = {
&psmouse_attr_protocol.dattr.attr,
&psmouse_attr_rate.dattr.attr,
&psmouse_attr_resolution.dattr.attr,
&psmouse_attr_resetafter.dattr.attr,
&psmouse_attr_resync_time.dattr.attr,
NULL
};
static struct attribute_group psmouse_attribute_group = {
.attrs = psmouse_attributes,
};
__obsolete_setup("psmouse_noext");
__obsolete_setup("psmouse_resolution=");
__obsolete_setup("psmouse_smartscroll=");
__obsolete_setup("psmouse_resetafter=");
__obsolete_setup("psmouse_rate=");
/*
* psmouse_mutex protects all operations changing state of mouse
* (connecting, disconnecting, changing rate or resolution via
* sysfs). We could use a per-device semaphore but since there
* rarely more than one PS/2 mouse connected and since semaphore
* is taken in "slow" paths it is not worth it.
*/
static DEFINE_MUTEX(psmouse_mutex);
static struct workqueue_struct *kpsmoused_wq;
struct psmouse_protocol {
enum psmouse_type type;
const char *name;
const char *alias;
int maxproto;
int (*detect)(struct psmouse *, int);
int (*init)(struct psmouse *);
};
/*
* 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 input_dev *dev = psmouse->dev;
unsigned char *packet = psmouse->packet;
if (psmouse->pktcnt < psmouse->pktsize)
return PSMOUSE_GOOD_DATA;
/*
* Full packet accumulated, process it
*/
/*
* 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) {
switch (packet[3] & 0xC0) {
case 0x80: /* vertical scroll on IntelliMouse Explorer 4.0 */
input_report_rel(dev, REL_WHEEL, (int) (packet[3] & 32) - (int) (packet[3] & 31));
break;
case 0x40: /* horizontal scroll on IntelliMouse Explorer 4.0 */
input_report_rel(dev, REL_HWHEEL, (int) (packet[3] & 32) - (int) (packet[3] & 31));
break;
case 0x00:
case 0xC0:
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);
break;
}
}
/*
* 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);
}
/*
* Extra button on ThinkingMouse
*/
if (psmouse->type == PSMOUSE_THINKPS) {
input_report_key(dev, BTN_EXTRA, (packet[0] >> 3) & 1);
/* Without this bit of weirdness moving up gives wildly high Y changes. */
packet[1] |= (packet[0] & 0x40) << 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_set_state() sets new psmouse state and resets all flags.
*/
static inline void __psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
{
psmouse->state = new_state;
psmouse->pktcnt = psmouse->out_of_sync = 0;
psmouse->ps2dev.flags = 0;
psmouse->last = jiffies;
}
/*
* psmouse_set_state() sets new psmouse state and resets all flags and
* counters while holding serio lock so fighting with interrupt handler
* is not a concern.
*/
static void psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
{
serio_pause_rx(psmouse->ps2dev.serio);
__psmouse_set_state(psmouse, new_state);
serio_continue_rx(psmouse->ps2dev.serio);
}
/*
* psmouse_handle_byte() processes one byte of the input data stream
* by calling corresponding protocol handler.
*/
static int psmouse_handle_byte(struct psmouse *psmouse)
{
psmouse_ret_t rc = psmouse->protocol_handler(psmouse);
switch (rc) {
case PSMOUSE_BAD_DATA:
if (psmouse->state == PSMOUSE_ACTIVATED) {
printk(KERN_WARNING "psmouse.c: %s at %s lost sync at byte %d\n",
psmouse->name, psmouse->phys, psmouse->pktcnt);
if (++psmouse->out_of_sync == psmouse->resetafter) {
__psmouse_set_state(psmouse, PSMOUSE_IGNORE);
printk(KERN_NOTICE "psmouse.c: issuing reconnect request\n");
serio_reconnect(psmouse->ps2dev.serio);
return -1;
}
}
psmouse->pktcnt = 0;
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;
}
return 0;
}
/*
* psmouse_interrupt() handles incoming characters, either passing them
* for normal processing or gathering them as command response.
*/
static irqreturn_t psmouse_interrupt(struct serio *serio,
unsigned char data, unsigned int flags)
{
struct psmouse *psmouse = serio_get_drvdata(serio);
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" : "");
ps2_cmd_aborted(&psmouse->ps2dev);
goto out;
}
if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_ACK))
if (ps2_handle_ack(&psmouse->ps2dev, data))
goto out;
if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_CMD))
if (ps2_handle_response(&psmouse->ps2dev, data))
goto out;
if (psmouse->state <= PSMOUSE_RESYNCING)
goto out;
if (psmouse->state == PSMOUSE_ACTIVATED &&
psmouse->pktcnt && time_after(jiffies, psmouse->last + HZ/2)) {
printk(KERN_INFO "psmouse.c: %s at %s lost synchronization, throwing %d bytes away.\n",
psmouse->name, psmouse->phys, psmouse->pktcnt);
psmouse->badbyte = psmouse->packet[0];
__psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
queue_work(kpsmoused_wq, &psmouse->resync_work);
goto out;
}
psmouse->packet[psmouse->pktcnt++] = data;
/*
* Check if this is a new device announcement (0xAA 0x00)
*/
if (unlikely(psmouse->packet[0] == PSMOUSE_RET_BAT && psmouse->pktcnt <= 2)) {
if (psmouse->pktcnt == 1) {
psmouse->last = jiffies;
goto out;
}
if (psmouse->packet[1] == PSMOUSE_RET_ID) {
__psmouse_set_state(psmouse, PSMOUSE_IGNORE);
serio_reconnect(serio);
goto out;
}
/*
* Not a new device, try processing first byte normally
*/
psmouse->pktcnt = 1;
if (psmouse_handle_byte(psmouse))
goto out;
psmouse->packet[psmouse->pktcnt++] = data;
}
/*
* See if we need to force resync because mouse was idle for too long
*/
if (psmouse->state == PSMOUSE_ACTIVATED &&
psmouse->pktcnt == 1 && psmouse->resync_time &&
time_after(jiffies, psmouse->last + psmouse->resync_time * HZ)) {
psmouse->badbyte = psmouse->packet[0];
__psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
queue_work(kpsmoused_wq, &psmouse->resync_work);
goto out;
}
psmouse->last = jiffies;
psmouse_handle_byte(psmouse);
out:
return IRQ_HANDLED;
}
/*
* 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 (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11))
return -1;
for (i = 6; i >= 0; i -= 2) {
unsigned char d = (command >> i) & 3;
if (ps2_command(&psmouse->ps2dev, &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 (ps2_command(&psmouse->ps2dev, 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, int set_properties)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
unsigned char param[4];
param[0] = 3;
ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11);
ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11);
ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11);
ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);
if (param[0] != 0x00 || param[1] != 0x33 || param[2] != 0x55)
return -1;
if (set_properties) {
set_bit(BTN_EXTRA, psmouse->dev->keybit);
set_bit(BTN_SIDE, psmouse->dev->keybit);
set_bit(REL_WHEEL, psmouse->dev->relbit);
psmouse->vendor = "Genius";
psmouse->name = "Mouse";
psmouse->pktsize = 4;
}
return 0;
}
/*
* IntelliMouse magic init.
*/
static int intellimouse_detect(struct psmouse *psmouse, int set_properties)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
unsigned char param[2];
param[0] = 200;
ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
param[0] = 100;
ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
param[0] = 80;
ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
if (param[0] != 3)
return -1;
if (set_properties) {
set_bit(BTN_MIDDLE, psmouse->dev->keybit);
set_bit(REL_WHEEL, psmouse->dev->relbit);
if (!psmouse->vendor) psmouse->vendor = "Generic";
if (!psmouse->name) psmouse->name = "Wheel Mouse";
psmouse->pktsize = 4;
}
return 0;
}
/*
* Try IntelliMouse/Explorer magic init.
*/
static int im_explorer_detect(struct psmouse *psmouse, int set_properties)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
unsigned char param[2];
intellimouse_detect(psmouse, 0);
param[0] = 200;
ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
param[0] = 200;
ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
param[0] = 80;
ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
if (param[0] != 4)
return -1;
/* Magic to enable horizontal scrolling on IntelliMouse 4.0 */
param[0] = 200;
ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
param[0] = 80;
ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
param[0] = 40;
ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
if (set_properties) {
set_bit(BTN_MIDDLE, psmouse->dev->keybit);
set_bit(REL_WHEEL, psmouse->dev->relbit);
set_bit(REL_HWHEEL, psmouse->dev->relbit);
set_bit(BTN_SIDE, psmouse->dev->keybit);
set_bit(BTN_EXTRA, psmouse->dev->keybit);
if (!psmouse->vendor) psmouse->vendor = "Generic";
if (!psmouse->name) psmouse->name = "Explorer Mouse";
psmouse->pktsize = 4;
}
return 0;
}
/*
* Kensington ThinkingMouse / ExpertMouse magic init.
*/
static int thinking_detect(struct psmouse *psmouse, int set_properties)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
unsigned char param[2];
static const unsigned char seq[] = { 20, 60, 40, 20, 20, 60, 40, 20, 20 };
int i;
param[0] = 10;
ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
param[0] = 0;
ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
for (i = 0; i < ARRAY_SIZE(seq); i++) {
param[0] = seq[i];
ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
}
ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
if (param[0] != 2)
return -1;
if (set_properties) {
set_bit(BTN_EXTRA, psmouse->dev->keybit);
psmouse->vendor = "Kensington";
psmouse->name = "ThinkingMouse";
}
return 0;
}
/*
* Bare PS/2 protocol "detection". Always succeeds.
*/
static int ps2bare_detect(struct psmouse *psmouse, int set_properties)
{
if (set_properties) {
if (!psmouse->vendor) psmouse->vendor = "Generic";
if (!psmouse->name) psmouse->name = "Mouse";
}
return 0;
}
/*
* psmouse_extensions() probes for any extensions to the basic PS/2 protocol
* the mouse may have.
*/
static int psmouse_extensions(struct psmouse *psmouse,
unsigned int max_proto, int set_properties)
{
int synaptics_hardware = 0;
/*
* We always check for lifebook because it does not disturb mouse
* (it only checks DMI information).
*/
if (lifebook_detect(psmouse, set_properties) == 0) {
if (max_proto > PSMOUSE_IMEX) {
if (!set_properties || lifebook_init(psmouse) == 0)
return PSMOUSE_LIFEBOOK;
}
}
/*
* Try Kensington ThinkingMouse (we try first, because synaptics probe
* upsets the thinkingmouse).
*/
if (max_proto > PSMOUSE_IMEX && thinking_detect(psmouse, set_properties) == 0)
return PSMOUSE_THINKPS;
/*
* Try Synaptics TouchPad
*/
if (max_proto > PSMOUSE_PS2 && synaptics_detect(psmouse, set_properties) == 0) {
synaptics_hardware = 1;
if (max_proto > PSMOUSE_IMEX) {
if (!set_properties || synaptics_init(psmouse) == 0)
return PSMOUSE_SYNAPTICS;
/*
* Some Synaptics touchpads can emulate extended protocols (like IMPS/2).
* Unfortunately Logitech/Genius probes confuse some firmware versions so
* we'll have to skip them.
*/
max_proto = PSMOUSE_IMEX;
}
/*
* Make sure that touchpad is in relative mode, gestures (taps) are enabled
*/
synaptics_reset(psmouse);
}
/*
* Try ALPS TouchPad
*/
if (max_proto > PSMOUSE_IMEX) {
ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
if (alps_detect(psmouse, set_properties) == 0) {
if (!set_properties || alps_init(psmouse) == 0)
return PSMOUSE_ALPS;
/*
* Init failed, try basic relative protocols
*/
max_proto = PSMOUSE_IMEX;
}
}
if (max_proto > PSMOUSE_IMEX && genius_detect(psmouse, set_properties) == 0)
return PSMOUSE_GENPS;
if (max_proto > PSMOUSE_IMEX && ps2pp_init(psmouse, set_properties) == 0)
return PSMOUSE_PS2PP;
if (max_proto > PSMOUSE_IMEX && trackpoint_detect(psmouse, set_properties) == 0)
return PSMOUSE_TRACKPOINT;
/*
* Reset to defaults in case the device got confused by extended
* protocol probes. Note that we do full reset becuase some mice
* put themselves to sleep when see PSMOUSE_RESET_DIS.
*/
psmouse_reset(psmouse);
if (max_proto >= PSMOUSE_IMEX && im_explorer_detect(psmouse, set_properties) == 0)
return PSMOUSE_IMEX;
if (max_proto >= PSMOUSE_IMPS && intellimouse_detect(psmouse, set_properties) == 0)
return PSMOUSE_IMPS;
/*
* Okay, all failed, we have a standard mouse here. The number of the buttons
* is still a question, though. We assume 3.
*/
ps2bare_detect(psmouse, set_properties);
if (synaptics_hardware) {
/*
* We detected Synaptics hardware but it did not respond to IMPS/2 probes.
* We need to reset the touchpad because if there is a track point on the
* pass through port it could get disabled while probing for protocol
* extensions.
*/
psmouse_reset(psmouse);
}
return PSMOUSE_PS2;
}
static const struct psmouse_protocol psmouse_protocols[] = {
{
.type = PSMOUSE_PS2,
.name = "PS/2",
.alias = "bare",
.maxproto = 1,
.detect = ps2bare_detect,
},
{
.type = PSMOUSE_PS2PP,
.name = "PS2++",
.alias = "logitech",
.detect = ps2pp_init,
},
{
.type = PSMOUSE_THINKPS,
.name = "ThinkPS/2",
.alias = "thinkps",
.detect = thinking_detect,
},
{
.type = PSMOUSE_GENPS,
.name = "GenPS/2",
.alias = "genius",
.detect = genius_detect,
},
{
.type = PSMOUSE_IMPS,
.name = "ImPS/2",
.alias = "imps",
.maxproto = 1,
.detect = intellimouse_detect,
},
{
.type = PSMOUSE_IMEX,
.name = "ImExPS/2",
.alias = "exps",
.maxproto = 1,
.detect = im_explorer_detect,
},
{
.type = PSMOUSE_SYNAPTICS,
.name = "SynPS/2",
.alias = "synaptics",
.detect = synaptics_detect,
.init = synaptics_init,
},
{
.type = PSMOUSE_ALPS,
.name = "AlpsPS/2",
.alias = "alps",
.detect = alps_detect,
.init = alps_init,
},
{
.type = PSMOUSE_LIFEBOOK,
.name = "LBPS/2",
.alias = "lifebook",
.init = lifebook_init,
},
{
.type = PSMOUSE_TRACKPOINT,
.name = "TPPS/2",
.alias = "trackpoint",
.detect = trackpoint_detect,
},
{
.type = PSMOUSE_AUTO,
.name = "auto",
.alias = "any",
.maxproto = 1,
},
};
static const struct psmouse_protocol *psmouse_protocol_by_type(enum psmouse_type type)
{
int i;
for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++)
if (psmouse_protocols[i].type == type)
return &psmouse_protocols[i];
WARN_ON(1);
return &psmouse_protocols[0];
}
static const struct psmouse_protocol *psmouse_protocol_by_name(const char *name, size_t len)
{
const struct psmouse_protocol *p;
int i;
for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++) {
p = &psmouse_protocols[i];
if ((strlen(p->name) == len && !strncmp(p->name, name, len)) ||
(strlen(p->alias) == len && !strncmp(p->alias, name, len)))
return &psmouse_protocols[i];
}
return NULL;
}
/*
* psmouse_probe() probes for a PS/2 mouse.
*/
static int psmouse_probe(struct psmouse *psmouse)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
unsigned char param[2];
/*
* First, we check if it's a mouse. It should send 0x00 or 0x03
* in case of an IntelliMouse in 4-byte mode or 0x04 for IM Explorer.
* Sunrex K8561 IR Keyboard/Mouse reports 0xff on second and subsequent
* ID queries, probably due to a firmware bug.
*/
param[0] = 0xa5;
if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETID))
return -1;
if (param[0] != 0x00 && param[0] != 0x03 &&
param[0] != 0x04 && param[0] != 0xff)
return -1;
/*
* Then we reset and disable the mouse so that it doesn't generate events.
*/
if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS))
printk(KERN_WARNING "psmouse.c: Failed to reset mouse on %s\n", ps2dev->serio->phys);
return 0;
}
/*
* Here we set the mouse resolution.
*/
void psmouse_set_resolution(struct psmouse *psmouse, unsigned int resolution)
{
static const unsigned char params[] = { 0, 1, 2, 2, 3 };
unsigned char p;
if (resolution == 0 || resolution > 200)
resolution = 200;
p = params[resolution / 50];
ps2_command(&psmouse->ps2dev, &p, PSMOUSE_CMD_SETRES);
psmouse->resolution = 25 << p;
}
/*
* Here we set the mouse report rate.
*/
static void psmouse_set_rate(struct psmouse *psmouse, unsigned int rate)
{
static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10, 0 };
unsigned char r;
int i = 0;
while (rates[i] > rate) i++;
r = rates[i];
ps2_command(&psmouse->ps2dev, &r, PSMOUSE_CMD_SETRATE);
psmouse->rate = r;
}
/*
* psmouse_initialize() initializes the mouse to a sane state.
*/
static void psmouse_initialize(struct psmouse *psmouse)
{
/*
* We set the mouse into streaming mode.
*/
ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSTREAM);
/*
* We set the mouse report rate, resolution and scaling.
*/
if (psmouse_max_proto != PSMOUSE_PS2) {
psmouse->set_rate(psmouse, psmouse->rate);
psmouse->set_resolution(psmouse, psmouse->resolution);
ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11);
}
}
/*
* psmouse_activate() enables the mouse so that we get motion reports from it.
*/
static void psmouse_activate(struct psmouse *psmouse)
{
if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE))
printk(KERN_WARNING "psmouse.c: Failed to enable mouse on %s\n",
psmouse->ps2dev.serio->phys);
psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
}
/*
* psmouse_deactivate() puts the mouse into poll mode so that we don't get motion
* reports from it unless we explicitely request it.
*/
static void psmouse_deactivate(struct psmouse *psmouse)
{
if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE))
printk(KERN_WARNING "psmouse.c: Failed to deactivate mouse on %s\n",
psmouse->ps2dev.serio->phys);
psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
}
/*
* psmouse_poll() - default poll hanlder. Everyone except for ALPS uses it.
*/
static int psmouse_poll(struct psmouse *psmouse)
{
return ps2_command(&psmouse->ps2dev, psmouse->packet,
PSMOUSE_CMD_POLL | (psmouse->pktsize << 8));
}
/*
* psmouse_resync() attempts to re-validate current protocol.
*/
static void psmouse_resync(void *p)
{
struct psmouse *psmouse = p, *parent = NULL;
struct serio *serio = psmouse->ps2dev.serio;
psmouse_ret_t rc = PSMOUSE_GOOD_DATA;
int failed = 0, enabled = 0;
int i;
mutex_lock(&psmouse_mutex);
if (psmouse->state != PSMOUSE_RESYNCING)
goto out;
if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
parent = serio_get_drvdata(serio->parent);
psmouse_deactivate(parent);
}
/*
* Some mice don't ACK commands sent while they are in the middle of
* transmitting motion packet. To avoid delay we use ps2_sendbyte()
* instead of ps2_command() which would wait for 200ms for an ACK
* that may never come.
* As an additional quirk ALPS touchpads may not only forget to ACK
* disable command but will stop reporting taps, so if we see that
* mouse at least once ACKs disable we will do full reconnect if ACK
* is missing.
*/
psmouse->num_resyncs++;
if (ps2_sendbyte(&psmouse->ps2dev, PSMOUSE_CMD_DISABLE, 20)) {
if (psmouse->num_resyncs < 3 || psmouse->acks_disable_command)
failed = 1;
} else
psmouse->acks_disable_command = 1;
/*
* Poll the mouse. If it was reset the packet will be shorter than
* psmouse->pktsize and ps2_command will fail. We do not expect and
* do not handle scenario when mouse "upgrades" its protocol while
* disconnected since it would require additional delay. If we ever
* see a mouse that does it we'll adjust the code.
*/
if (!failed) {
if (psmouse->poll(psmouse))
failed = 1;
else {
psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
for (i = 0; i < psmouse->pktsize; i++) {
psmouse->pktcnt++;
rc = psmouse->protocol_handler(psmouse);
if (rc != PSMOUSE_GOOD_DATA)
break;
}
if (rc != PSMOUSE_FULL_PACKET)
failed = 1;
psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
}
}
/*
* Now try to enable mouse. We try to do that even if poll failed and also
* repeat our attempts 5 times, otherwise we may be left out with disabled
* mouse.
*/
for (i = 0; i < 5; i++) {
if (!ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
enabled = 1;
break;
}
msleep(200);
}
if (!enabled) {
printk(KERN_WARNING "psmouse.c: failed to re-enable mouse on %s\n",
psmouse->ps2dev.serio->phys);
failed = 1;
}
if (failed) {
psmouse_set_state(psmouse, PSMOUSE_IGNORE);
printk(KERN_INFO "psmouse.c: resync failed, issuing reconnect request\n");
serio_reconnect(serio);
} else
psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
if (parent)
psmouse_activate(parent);
out:
mutex_unlock(&psmouse_mutex);
}
/*
* psmouse_cleanup() resets the mouse into power-on state.
*/
static void psmouse_cleanup(struct serio *serio)
{
struct psmouse *psmouse = serio_get_drvdata(serio);
psmouse_reset(psmouse);
}
/*
* psmouse_disconnect() closes and frees.
*/
static void psmouse_disconnect(struct serio *serio)
{
struct psmouse *psmouse, *parent = NULL;
psmouse = serio_get_drvdata(serio);
sysfs_remove_group(&serio->dev.kobj, &psmouse_attribute_group);
mutex_lock(&psmouse_mutex);
psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
/* make sure we don't have a resync in progress */
mutex_unlock(&psmouse_mutex);
flush_workqueue(kpsmoused_wq);
mutex_lock(&psmouse_mutex);
if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
parent = serio_get_drvdata(serio->parent);
psmouse_deactivate(parent);
}
if (psmouse->disconnect)
psmouse->disconnect(psmouse);
if (parent && parent->pt_deactivate)
parent->pt_deactivate(parent);
psmouse_set_state(psmouse, PSMOUSE_IGNORE);
serio_close(serio);
serio_set_drvdata(serio, NULL);
input_unregister_device(psmouse->dev);
kfree(psmouse);
if (parent)
psmouse_activate(parent);
mutex_unlock(&psmouse_mutex);
}
static int psmouse_switch_protocol(struct psmouse *psmouse, const struct psmouse_protocol *proto)
{
struct input_dev *input_dev = psmouse->dev;
input_dev->private = psmouse;
input_dev->cdev.dev = &psmouse->ps2dev.serio->dev;
input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REL);
input_dev->keybit[LONG(BTN_MOUSE)] = BIT(BTN_LEFT) | BIT(BTN_MIDDLE) | BIT(BTN_RIGHT);
input_dev->relbit[0] = BIT(REL_X) | BIT(REL_Y);
psmouse->set_rate = psmouse_set_rate;
psmouse->set_resolution = psmouse_set_resolution;
psmouse->poll = psmouse_poll;
psmouse->protocol_handler = psmouse_process_byte;
psmouse->pktsize = 3;
if (proto && (proto->detect || proto->init)) {
if (proto->detect && proto->detect(psmouse, 1) < 0)
return -1;
if (proto->init && proto->init(psmouse) < 0)
return -1;
psmouse->type = proto->type;
}
else
psmouse->type = psmouse_extensions(psmouse, psmouse_max_proto, 1);
/*
* If mouse's packet size is 3 there is no point in polling the
* device in hopes to detect protocol reset - we won't get less
* than 3 bytes response anyhow.
*/
if (psmouse->pktsize == 3)
psmouse->resync_time = 0;
/*
* Some smart KVMs fake response to POLL command returning just
* 3 bytes and messing up our resync logic, so if initial poll
* fails we won't try polling the device anymore. Hopefully
* such KVM will maintain initially selected protocol.
*/
if (psmouse->resync_time && psmouse->poll(psmouse))
psmouse->resync_time = 0;
snprintf(psmouse->devname, sizeof(psmouse->devname), "%s %s %s",
psmouse_protocol_by_type(psmouse->type)->name, psmouse->vendor, psmouse->name);
input_dev->name = psmouse->devname;
input_dev->phys = psmouse->phys;
input_dev->id.bustype = BUS_I8042;
input_dev->id.vendor = 0x0002;
input_dev->id.product = psmouse->type;
input_dev->id.version = psmouse->model;
return 0;
}
/*
* psmouse_connect() is a callback from the serio module when
* an unhandled serio port is found.
*/
static int psmouse_connect(struct serio *serio, struct serio_driver *drv)
{
struct psmouse *psmouse, *parent = NULL;
struct input_dev *input_dev;
int retval = -ENOMEM;
mutex_lock(&psmouse_mutex);
/*
* If this is a pass-through port deactivate parent so the device
* connected to this port can be successfully identified
*/
if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
parent = serio_get_drvdata(serio->parent);
psmouse_deactivate(parent);
}
psmouse = kzalloc(sizeof(struct psmouse), GFP_KERNEL);
input_dev = input_allocate_device();
if (!psmouse || !input_dev)
goto out;
ps2_init(&psmouse->ps2dev, serio);
INIT_WORK(&psmouse->resync_work, psmouse_resync, psmouse);
psmouse->dev = input_dev;
snprintf(psmouse->phys, sizeof(psmouse->phys), "%s/input0", serio->phys);
psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
serio_set_drvdata(serio, psmouse);
retval = serio_open(serio, drv);
if (retval)
goto out;
if (psmouse_probe(psmouse) < 0) {
serio_close(serio);
retval = -ENODEV;
goto out;
}
psmouse->rate = psmouse_rate;
psmouse->resolution = psmouse_resolution;
psmouse->resetafter = psmouse_resetafter;
psmouse->resync_time = parent ? 0 : psmouse_resync_time;
psmouse->smartscroll = psmouse_smartscroll;
psmouse_switch_protocol(psmouse, NULL);
psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
psmouse_initialize(psmouse);
input_register_device(psmouse->dev);
if (parent && parent->pt_activate)
parent->pt_activate(parent);
sysfs_create_group(&serio->dev.kobj, &psmouse_attribute_group);
psmouse_activate(psmouse);
retval = 0;
out:
if (retval) {
serio_set_drvdata(serio, NULL);
input_free_device(input_dev);
kfree(psmouse);
}
/* If this is a pass-through port the parent needs to be re-activated */
if (parent)
psmouse_activate(parent);
mutex_unlock(&psmouse_mutex);
return retval;
}
static int psmouse_reconnect(struct serio *serio)
{
struct psmouse *psmouse = serio_get_drvdata(serio);
struct psmouse *parent = NULL;
struct serio_driver *drv = serio->drv;
int rc = -1;
if (!drv || !psmouse) {
printk(KERN_DEBUG "psmouse: reconnect request, but serio is disconnected, ignoring...\n");
return -1;
}
mutex_lock(&psmouse_mutex);
if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
parent = serio_get_drvdata(serio->parent);
psmouse_deactivate(parent);
}
psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
if (psmouse->reconnect) {
if (psmouse->reconnect(psmouse))
goto out;
} else if (psmouse_probe(psmouse) < 0 ||
psmouse->type != psmouse_extensions(psmouse, psmouse_max_proto, 0))
goto out;
/* ok, the device type (and capabilities) match the old one,
* we can continue using it, complete intialization
*/
psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
psmouse_initialize(psmouse);
if (parent && parent->pt_activate)
parent->pt_activate(parent);
psmouse_activate(psmouse);
rc = 0;
out:
/* If this is a pass-through port the parent waits to be activated */
if (parent)
psmouse_activate(parent);
mutex_unlock(&psmouse_mutex);
return rc;
}
static struct serio_device_id psmouse_serio_ids[] = {
{
.type = SERIO_8042,
.proto = SERIO_ANY,
.id = SERIO_ANY,
.extra = SERIO_ANY,
},
{
.type = SERIO_PS_PSTHRU,
.proto = SERIO_ANY,
.id = SERIO_ANY,
.extra = SERIO_ANY,
},
{ 0 }
};
MODULE_DEVICE_TABLE(serio, psmouse_serio_ids);
static struct serio_driver psmouse_drv = {
.driver = {
.name = "psmouse",
},
.description = DRIVER_DESC,
.id_table = psmouse_serio_ids,
.interrupt = psmouse_interrupt,
.connect = psmouse_connect,
.reconnect = psmouse_reconnect,
.disconnect = psmouse_disconnect,
.cleanup = psmouse_cleanup,
};
ssize_t psmouse_attr_show_helper(struct device *dev, struct device_attribute *devattr,
char *buf)
{
struct serio *serio = to_serio_port(dev);
struct psmouse_attribute *attr = to_psmouse_attr(devattr);
struct psmouse *psmouse;
int retval;
retval = serio_pin_driver(serio);
if (retval)
return retval;
if (serio->drv != &psmouse_drv) {
retval = -ENODEV;
goto out;
}
psmouse = serio_get_drvdata(serio);
retval = attr->show(psmouse, attr->data, buf);
out:
serio_unpin_driver(serio);
return retval;
}
ssize_t psmouse_attr_set_helper(struct device *dev, struct device_attribute *devattr,
const char *buf, size_t count)
{
struct serio *serio = to_serio_port(dev);
struct psmouse_attribute *attr = to_psmouse_attr(devattr);
struct psmouse *psmouse, *parent = NULL;
int retval;
retval = serio_pin_driver(serio);
if (retval)
return retval;
if (serio->drv != &psmouse_drv) {
retval = -ENODEV;
goto out_unpin;
}
retval = mutex_lock_interruptible(&psmouse_mutex);
if (retval)
goto out_unpin;
psmouse = serio_get_drvdata(serio);
if (psmouse->state == PSMOUSE_IGNORE) {
retval = -ENODEV;
goto out_unlock;
}
if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
parent = serio_get_drvdata(serio->parent);
psmouse_deactivate(parent);
}
psmouse_deactivate(psmouse);
retval = attr->set(psmouse, attr->data, buf, count);
if (retval != -ENODEV)
psmouse_activate(psmouse);
if (parent)
psmouse_activate(parent);
out_unlock:
mutex_unlock(&psmouse_mutex);
out_unpin:
serio_unpin_driver(serio);
return retval;
}
static ssize_t psmouse_show_int_attr(struct psmouse *psmouse, void *offset, char *buf)
{
unsigned long *field = (unsigned long *)((char *)psmouse + (size_t)offset);
return sprintf(buf, "%lu\n", *field);
}
static ssize_t psmouse_set_int_attr(struct psmouse *psmouse, void *offset, const char *buf, size_t count)
{
unsigned long *field = (unsigned long *)((char *)psmouse + (size_t)offset);
unsigned long value;
char *rest;
value = simple_strtoul(buf, &rest, 10);
if (*rest)
return -EINVAL;
*field = value;
return count;
}
static ssize_t psmouse_attr_show_protocol(struct psmouse *psmouse, void *data, char *buf)
{
return sprintf(buf, "%s\n", psmouse_protocol_by_type(psmouse->type)->name);
}
static ssize_t psmouse_attr_set_protocol(struct psmouse *psmouse, void *data, const char *buf, size_t count)
{
struct serio *serio = psmouse->ps2dev.serio;
struct psmouse *parent = NULL;
struct input_dev *new_dev;
const struct psmouse_protocol *proto;
int retry = 0;
if (!(proto = psmouse_protocol_by_name(buf, count)))
return -EINVAL;
if (psmouse->type == proto->type)
return count;
if (!(new_dev = input_allocate_device()))
return -ENOMEM;
while (serio->child) {
if (++retry > 3) {
printk(KERN_WARNING "psmouse: failed to destroy child port, protocol change aborted.\n");
input_free_device(new_dev);
return -EIO;
}
mutex_unlock(&psmouse_mutex);
serio_unpin_driver(serio);
serio_unregister_child_port(serio);
serio_pin_driver_uninterruptible(serio);
mutex_lock(&psmouse_mutex);
if (serio->drv != &psmouse_drv) {
input_free_device(new_dev);
return -ENODEV;
}
if (psmouse->type == proto->type) {
input_free_device(new_dev);
return count; /* switched by other thread */
}
}
if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
parent = serio_get_drvdata(serio->parent);
if (parent->pt_deactivate)
parent->pt_deactivate(parent);
}
if (psmouse->disconnect)
psmouse->disconnect(psmouse);
psmouse_set_state(psmouse, PSMOUSE_IGNORE);
input_unregister_device(psmouse->dev);
psmouse->dev = new_dev;
psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
if (psmouse_switch_protocol(psmouse, proto) < 0) {
psmouse_reset(psmouse);
/* default to PSMOUSE_PS2 */
psmouse_switch_protocol(psmouse, &psmouse_protocols[0]);
}
psmouse_initialize(psmouse);
psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
input_register_device(psmouse->dev);
if (parent && parent->pt_activate)
parent->pt_activate(parent);
return count;
}
static ssize_t psmouse_attr_set_rate(struct psmouse *psmouse, void *data, const char *buf, size_t count)
{
unsigned long value;
char *rest;
value = simple_strtoul(buf, &rest, 10);
if (*rest)
return -EINVAL;
psmouse->set_rate(psmouse, value);
return count;
}
static ssize_t psmouse_attr_set_resolution(struct psmouse *psmouse, void *data, const char *buf, size_t count)
{
unsigned long value;
char *rest;
value = simple_strtoul(buf, &rest, 10);
if (*rest)
return -EINVAL;
psmouse->set_resolution(psmouse, value);
return count;
}
static int psmouse_set_maxproto(const char *val, struct kernel_param *kp)
{
const struct psmouse_protocol *proto;
if (!val)
return -EINVAL;
proto = psmouse_protocol_by_name(val, strlen(val));
if (!proto || !proto->maxproto)
return -EINVAL;
*((unsigned int *)kp->arg) = proto->type;
return 0;
}
static int psmouse_get_maxproto(char *buffer, struct kernel_param *kp)
{
int type = *((unsigned int *)kp->arg);
return sprintf(buffer, "%s\n", psmouse_protocol_by_type(type)->name);
}
static int __init psmouse_init(void)
{
kpsmoused_wq = create_singlethread_workqueue("kpsmoused");
if (!kpsmoused_wq) {
printk(KERN_ERR "psmouse: failed to create kpsmoused workqueue\n");
return -ENOMEM;
}
serio_register_driver(&psmouse_drv);
return 0;
}
static void __exit psmouse_exit(void)
{
serio_unregister_driver(&psmouse_drv);
destroy_workqueue(kpsmoused_wq);
}
module_init(psmouse_init);
module_exit(psmouse_exit);
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