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Input: psmouse - attempt to re-synchronize mouse every 5 seconds 

This should help driver to deal vith KVMs that reset mice when
switching between boxes.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Torokhov 2006-01-14 00:27:37 -05:00
parent b65d0d1bac
commit f0d5c6f419
5 changed files with 302 additions and 67 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
drivers/input/mouse/alps.c
View File

@ -348,6 +348,40 @@ static int alps_tap_mode(struct psmouse *psmouse, int enable)
return 0;
}
/*
* alps_poll() - poll the touchpad for current motion packet.
* Used in resync.
*/
static int alps_poll(struct psmouse *psmouse)
{
struct alps_data *priv = psmouse->private;
unsigned char buf[6];
int poll_failed;
if (priv->i->flags & ALPS_PASS)
alps_passthrough_mode(psmouse, 1);
poll_failed = ps2_command(&psmouse->ps2dev, buf,
PSMOUSE_CMD_POLL | (psmouse->pktsize << 8)) < 0;
if (priv->i->flags & ALPS_PASS)
alps_passthrough_mode(psmouse, 0);
if (poll_failed || (buf[0] & priv->i->mask0) != priv->i->byte0)
return -1;
if ((psmouse->badbyte & 0xc8) == 0x08) {
/*
* Poll the track stick ...
*/
if (ps2_command(&psmouse->ps2dev, buf, PSMOUSE_CMD_POLL | (3 << 8)))
return -1;
}
memcpy(psmouse->packet, buf, sizeof(buf));
return 0;
}
static int alps_reconnect(struct psmouse *psmouse)
{
struct alps_data *priv = psmouse->private;
@ -451,10 +485,14 @@ int alps_init(struct psmouse *psmouse)
input_register_device(priv->dev2);
psmouse->protocol_handler = alps_process_byte;
psmouse->poll = alps_poll;
psmouse->disconnect = alps_disconnect;
psmouse->reconnect = alps_reconnect;
psmouse->pktsize = 6;
/* We are having trouble resyncing ALPS touchpads so disable it for now */
psmouse->resync_time = 0;
return 0;
init_fail:

2
drivers/input/mouse/logips2pp.c
View File

@ -117,7 +117,7 @@ static int ps2pp_cmd(struct psmouse *psmouse, unsigned char *param, unsigned cha
if (psmouse_sliced_command(psmouse, command))
return -1;
if (ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_POLL))
if (ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_POLL | 0x0300))
return -1;
return 0;

318
drivers/input/mouse/psmouse-base.c
View File

@ -54,10 +54,14 @@ 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;
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 = 5;
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);
@ -70,12 +74,16 @@ PSMOUSE_DEFINE_ATTR(resolution, S_IWUSR | S_IRUGO,
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
};
@ -98,6 +106,8 @@ __obsolete_setup("psmouse_rate=");
*/
static DECLARE_MUTEX(psmouse_sem);
static struct workqueue_struct *kpsmoused_wq;
struct psmouse_protocol {
enum psmouse_type type;
char *name;
@ -178,15 +188,79 @@ static psmouse_ret_t psmouse_process_byte(struct psmouse *psmouse, struct pt_reg
}
/*
* psmouse_interrupt() handles incoming characters, either gathering them into
* packets or passing them to the command routine as command output.
* __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, struct pt_regs *regs)
{
psmouse_ret_t rc = psmouse->protocol_handler(psmouse, regs);
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 pt_regs *regs)
{
struct psmouse *psmouse = serio_get_drvdata(serio);
psmouse_ret_t rc;
if (psmouse->state == PSMOUSE_IGNORE)
goto out;
@ -208,67 +282,58 @@ static irqreturn_t psmouse_interrupt(struct serio *serio,
if (ps2_handle_response(&psmouse->ps2dev, data))
goto out;
if (psmouse->state == PSMOUSE_INITIALIZING)
if (psmouse->state <= PSMOUSE_RESYNCING)
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",
printk(KERN_INFO "psmouse.c: %s at %s lost synchronization, throwing %d bytes away.\n",
psmouse->name, psmouse->phys, psmouse->pktcnt);
psmouse->pktcnt = 0;
psmouse->badbyte = psmouse->packet[0];
__psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
queue_work(kpsmoused_wq, &psmouse->resync_work);
goto out;
}
psmouse->last = jiffies;
psmouse->packet[psmouse->pktcnt++] = data;
if (psmouse->packet[0] == PSMOUSE_RET_BAT) {
/*
* 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)
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;
}
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, regs))
goto out;
psmouse->packet[psmouse->pktcnt++] = data;
}
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->ps2dev.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;
/*
* 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;
}
out:
psmouse->last = jiffies;
psmouse_handle_byte(psmouse, regs);
out:
return IRQ_HANDLED;
}
@ -751,21 +816,6 @@ static void psmouse_initialize(struct psmouse *psmouse)
}
}
/*
* 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->state = new_state;
psmouse->pktcnt = psmouse->out_of_sync = 0;
psmouse->ps2dev.flags = 0;
serio_continue_rx(psmouse->ps2dev.serio);
}
/*
* psmouse_activate() enables the mouse so that we get motion reports from it.
*/
@ -794,6 +844,111 @@ static void psmouse_deactivate(struct psmouse *psmouse)
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;
down(&psmouse_sem);
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, NULL);
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:
up(&psmouse_sem);
}
/*
* psmouse_cleanup() resets the mouse into power-on state.
@ -822,6 +977,11 @@ static void psmouse_disconnect(struct serio *serio)
psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
/* make sure we don't have a resync in progress */
up(&psmouse_sem);
flush_workqueue(kpsmoused_wq);
down(&psmouse_sem);
if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
parent = serio_get_drvdata(serio->parent);
psmouse_deactivate(parent);
@ -859,6 +1019,7 @@ static int psmouse_switch_protocol(struct psmouse *psmouse, struct psmouse_proto
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;
@ -874,6 +1035,23 @@ static int psmouse_switch_protocol(struct psmouse *psmouse, struct psmouse_proto
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;
sprintf(psmouse->devname, "%s %s %s",
psmouse_protocol_by_type(psmouse->type)->name, psmouse->vendor, psmouse->name);
@ -914,6 +1092,7 @@ static int psmouse_connect(struct serio *serio, struct serio_driver *drv)
goto out;
ps2_init(&psmouse->ps2dev, serio);
INIT_WORK(&psmouse->resync_work, psmouse_resync, psmouse);
psmouse->dev = input_dev;
sprintf(psmouse->phys, "%s/input0", serio->phys);
@ -934,6 +1113,7 @@ static int psmouse_connect(struct serio *serio, struct serio_driver *drv)
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);
@ -1278,13 +1458,21 @@ static int psmouse_get_maxproto(char *buffer, struct kernel_param *kp)
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);

9
drivers/input/mouse/psmouse.h
View File

@ -7,7 +7,7 @@
#define PSMOUSE_CMD_GETINFO 0x03e9
#define PSMOUSE_CMD_SETSTREAM 0x00ea
#define PSMOUSE_CMD_SETPOLL 0x00f0
#define PSMOUSE_CMD_POLL 0x03eb
#define PSMOUSE_CMD_POLL 0x00eb /* caller sets number of bytes to receive */
#define PSMOUSE_CMD_GETID 0x02f2
#define PSMOUSE_CMD_SETRATE 0x10f3
#define PSMOUSE_CMD_ENABLE 0x00f4
@ -23,6 +23,7 @@
enum psmouse_state {
PSMOUSE_IGNORE,
PSMOUSE_INITIALIZING,
PSMOUSE_RESYNCING,
PSMOUSE_CMD_MODE,
PSMOUSE_ACTIVATED,
};
@ -38,15 +39,19 @@ struct psmouse {
void *private;
struct input_dev *dev;
struct ps2dev ps2dev;
struct work_struct resync_work;
char *vendor;
char *name;
unsigned char packet[8];
unsigned char badbyte;
unsigned char pktcnt;
unsigned char pktsize;
unsigned char type;
unsigned char acks_disable_command;
unsigned int model;
unsigned long last;
unsigned long out_of_sync;
unsigned long num_resyncs;
enum psmouse_state state;
char devname[64];
char phys[32];
@ -54,6 +59,7 @@ struct psmouse {
unsigned int rate;
unsigned int resolution;
unsigned int resetafter;
unsigned int resync_time;
unsigned int smartscroll; /* Logitech only */
psmouse_ret_t (*protocol_handler)(struct psmouse *psmouse, struct pt_regs *regs);
@ -62,6 +68,7 @@ struct psmouse {
int (*reconnect)(struct psmouse *psmouse);
void (*disconnect)(struct psmouse *psmouse);
int (*poll)(struct psmouse *psmouse);
void (*pt_activate)(struct psmouse *psmouse);
void (*pt_deactivate)(struct psmouse *psmouse);

2
drivers/input/mouse/synaptics.c
View File

@ -652,6 +652,8 @@ int synaptics_init(struct psmouse *psmouse)
psmouse->disconnect = synaptics_disconnect;
psmouse->reconnect = synaptics_reconnect;
psmouse->pktsize = 6;
/* Synaptics can usually stay in sync without extra help */
psmouse->resync_time = 0;
if (SYN_CAP_PASS_THROUGH(priv->capabilities))
synaptics_pt_create(psmouse);