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);
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 DECLARE_MUTEX(psmouse_sem);
+static struct workqueue_struct *kpsmoused_wq;
+
struct psmouse_protocol {
enum psmouse_type type;
char *name;
}
/*
- * 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;
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;
}
- }
-
- rc = psmouse->protocol_handler(psmouse, regs);
+/*
+ * Not a new device, try processing first byte normally
+ */
+ psmouse->pktcnt = 1;
+ if (psmouse_handle_byte(psmouse, regs))
+ goto out;
- 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;
+ psmouse->packet[psmouse->pktcnt++] = data;
+ }
- 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;
+/*
+ * 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;
+ }
- 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;
+ psmouse->last = jiffies;
+ psmouse_handle_byte(psmouse, regs);
- case PSMOUSE_GOOD_DATA:
- break;
- }
-out:
+ out:
return IRQ_HANDLED;
}
}
}
-/*
- * 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.
*/
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.
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);
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;
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);
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);
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);
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);
projects / GitHub / LineageOS / android_kernel_samsung_universal7580.git / commitdiff