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path: root/drivers/input/serio/libps2.c
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Diffstat (limited to 'drivers/input/serio/libps2.c')
-rw-r--r--drivers/input/serio/libps2.c322
1 files changed, 219 insertions, 103 deletions
diff --git a/drivers/input/serio/libps2.c b/drivers/input/serio/libps2.c
index 83e9c663aa67..e6a07e68d1ff 100644
--- a/drivers/input/serio/libps2.c
+++ b/drivers/input/serio/libps2.c
@@ -26,31 +26,79 @@ MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
MODULE_DESCRIPTION("PS/2 driver library");
MODULE_LICENSE("GPL");
+static int ps2_do_sendbyte(struct ps2dev *ps2dev, u8 byte,
+ unsigned int timeout, unsigned int max_attempts)
+ __releases(&ps2dev->serio->lock) __acquires(&ps2dev->serio->lock)
+{
+ int attempt = 0;
+ int error;
+
+ lockdep_assert_held(&ps2dev->serio->lock);
+
+ do {
+ ps2dev->nak = 1;
+ ps2dev->flags |= PS2_FLAG_ACK;
+
+ serio_continue_rx(ps2dev->serio);
+
+ error = serio_write(ps2dev->serio, byte);
+ if (error)
+ dev_dbg(&ps2dev->serio->dev,
+ "failed to write %#02x: %d\n", byte, error);
+ else
+ wait_event_timeout(ps2dev->wait,
+ !(ps2dev->flags & PS2_FLAG_ACK),
+ msecs_to_jiffies(timeout));
+
+ serio_pause_rx(ps2dev->serio);
+ } while (ps2dev->nak == PS2_RET_NAK && ++attempt < max_attempts);
+
+ ps2dev->flags &= ~PS2_FLAG_ACK;
+
+ if (!error) {
+ switch (ps2dev->nak) {
+ case 0:
+ break;
+ case PS2_RET_NAK:
+ error = -EAGAIN;
+ break;
+ case PS2_RET_ERR:
+ error = -EPROTO;
+ break;
+ default:
+ error = -EIO;
+ break;
+ }
+ }
+
+ if (error || attempt > 1)
+ dev_dbg(&ps2dev->serio->dev,
+ "%02x - %d (%x), attempt %d\n",
+ byte, error, ps2dev->nak, attempt);
+
+ return error;
+}
+
/*
* ps2_sendbyte() sends a byte to the device and waits for acknowledge.
- * It doesn't handle retransmission, though it could - because if there
- * is a need for retransmissions device has to be replaced anyway.
+ * It doesn't handle retransmission, the caller is expected to handle
+ * it when needed.
*
* ps2_sendbyte() can only be called from a process context.
*/
-int ps2_sendbyte(struct ps2dev *ps2dev, unsigned char byte, int timeout)
+int ps2_sendbyte(struct ps2dev *ps2dev, u8 byte, unsigned int timeout)
{
+ int retval;
+
serio_pause_rx(ps2dev->serio);
- ps2dev->nak = 1;
- ps2dev->flags |= PS2_FLAG_ACK;
- serio_continue_rx(ps2dev->serio);
- if (serio_write(ps2dev->serio, byte) == 0)
- wait_event_timeout(ps2dev->wait,
- !(ps2dev->flags & PS2_FLAG_ACK),
- msecs_to_jiffies(timeout));
+ retval = ps2_do_sendbyte(ps2dev, byte, timeout, 1);
+ dev_dbg(&ps2dev->serio->dev, "%02x - %x\n", byte, ps2dev->nak);
- serio_pause_rx(ps2dev->serio);
- ps2dev->flags &= ~PS2_FLAG_ACK;
serio_continue_rx(ps2dev->serio);
- return -ps2dev->nak;
+ return retval;
}
EXPORT_SYMBOL(ps2_sendbyte);
@@ -75,7 +123,7 @@ EXPORT_SYMBOL(ps2_end_command);
* and discards them.
*/
-void ps2_drain(struct ps2dev *ps2dev, int maxbytes, int timeout)
+void ps2_drain(struct ps2dev *ps2dev, size_t maxbytes, unsigned int timeout)
{
if (maxbytes > sizeof(ps2dev->cmdbuf)) {
WARN_ON(1);
@@ -102,9 +150,9 @@ EXPORT_SYMBOL(ps2_drain);
* known keyboard IDs.
*/
-int ps2_is_keyboard_id(char id_byte)
+bool ps2_is_keyboard_id(u8 id_byte)
{
- static const char keyboard_ids[] = {
+ static const u8 keyboard_ids[] = {
0xab, /* Regular keyboards */
0xac, /* NCD Sun keyboard */
0x2b, /* Trust keyboard, translated */
@@ -123,49 +171,50 @@ EXPORT_SYMBOL(ps2_is_keyboard_id);
* completion.
*/
-static int ps2_adjust_timeout(struct ps2dev *ps2dev, int command, int timeout)
+static int ps2_adjust_timeout(struct ps2dev *ps2dev,
+ unsigned int command, unsigned int timeout)
{
switch (command) {
- case PS2_CMD_RESET_BAT:
- /*
- * Device has sent the first response byte after
- * reset command, reset is thus done, so we can
- * shorten the timeout.
- * The next byte will come soon (keyboard) or not
- * at all (mouse).
- */
- if (timeout > msecs_to_jiffies(100))
- timeout = msecs_to_jiffies(100);
- break;
+ case PS2_CMD_RESET_BAT:
+ /*
+ * Device has sent the first response byte after
+ * reset command, reset is thus done, so we can
+ * shorten the timeout.
+ * The next byte will come soon (keyboard) or not
+ * at all (mouse).
+ */
+ if (timeout > msecs_to_jiffies(100))
+ timeout = msecs_to_jiffies(100);
+ break;
- case PS2_CMD_GETID:
- /*
- * Microsoft Natural Elite keyboard responds to
- * the GET ID command as it were a mouse, with
- * a single byte. Fail the command so atkbd will
- * use alternative probe to detect it.
- */
- if (ps2dev->cmdbuf[1] == 0xaa) {
- serio_pause_rx(ps2dev->serio);
- ps2dev->flags = 0;
- serio_continue_rx(ps2dev->serio);
- timeout = 0;
- }
-
- /*
- * If device behind the port is not a keyboard there
- * won't be 2nd byte of ID response.
- */
- if (!ps2_is_keyboard_id(ps2dev->cmdbuf[1])) {
- serio_pause_rx(ps2dev->serio);
- ps2dev->flags = ps2dev->cmdcnt = 0;
- serio_continue_rx(ps2dev->serio);
- timeout = 0;
- }
- break;
+ case PS2_CMD_GETID:
+ /*
+ * Microsoft Natural Elite keyboard responds to
+ * the GET ID command as it were a mouse, with
+ * a single byte. Fail the command so atkbd will
+ * use alternative probe to detect it.
+ */
+ if (ps2dev->cmdbuf[1] == 0xaa) {
+ serio_pause_rx(ps2dev->serio);
+ ps2dev->flags = 0;
+ serio_continue_rx(ps2dev->serio);
+ timeout = 0;
+ }
- default:
- break;
+ /*
+ * If device behind the port is not a keyboard there
+ * won't be 2nd byte of ID response.
+ */
+ if (!ps2_is_keyboard_id(ps2dev->cmdbuf[1])) {
+ serio_pause_rx(ps2dev->serio);
+ ps2dev->flags = ps2dev->cmdcnt = 0;
+ serio_continue_rx(ps2dev->serio);
+ timeout = 0;
+ }
+ break;
+
+ default:
+ break;
}
return timeout;
@@ -178,50 +227,60 @@ static int ps2_adjust_timeout(struct ps2dev *ps2dev, int command, int timeout)
* ps2_command() can only be called from a process context
*/
-int __ps2_command(struct ps2dev *ps2dev, unsigned char *param, int command)
+int __ps2_command(struct ps2dev *ps2dev, u8 *param, unsigned int command)
{
- int timeout;
- int send = (command >> 12) & 0xf;
- int receive = (command >> 8) & 0xf;
- int rc = -1;
+ unsigned int timeout;
+ unsigned int send = (command >> 12) & 0xf;
+ unsigned int receive = (command >> 8) & 0xf;
+ int rc;
int i;
+ u8 send_param[16];
if (receive > sizeof(ps2dev->cmdbuf)) {
WARN_ON(1);
- return -1;
+ return -EINVAL;
}
if (send && !param) {
WARN_ON(1);
- return -1;
+ return -EINVAL;
}
+ memcpy(send_param, param, send);
+
serio_pause_rx(ps2dev->serio);
+
ps2dev->flags = command == PS2_CMD_GETID ? PS2_FLAG_WAITID : 0;
ps2dev->cmdcnt = receive;
if (receive && param)
for (i = 0; i < receive; i++)
ps2dev->cmdbuf[(receive - 1) - i] = param[i];
- serio_continue_rx(ps2dev->serio);
+
+ /* Signal that we are sending the command byte */
+ ps2dev->flags |= PS2_FLAG_ACK_CMD;
/*
* Some devices (Synaptics) peform the reset before
* ACKing the reset command, and so it can take a long
* time before the ACK arrives.
*/
- if (ps2_sendbyte(ps2dev, command & 0xff,
- command == PS2_CMD_RESET_BAT ? 1000 : 200)) {
- serio_pause_rx(ps2dev->serio);
+ timeout = command == PS2_CMD_RESET_BAT ? 1000 : 200;
+
+ rc = ps2_do_sendbyte(ps2dev, command & 0xff, timeout, 2);
+ if (rc)
goto out_reset_flags;
- }
+
+ /* Now we are sending command parameters, if any */
+ ps2dev->flags &= ~PS2_FLAG_ACK_CMD;
for (i = 0; i < send; i++) {
- if (ps2_sendbyte(ps2dev, param[i], 200)) {
- serio_pause_rx(ps2dev->serio);
+ rc = ps2_do_sendbyte(ps2dev, param[i], 200, 2);
+ if (rc)
goto out_reset_flags;
- }
}
+ serio_continue_rx(ps2dev->serio);
+
/*
* The reset command takes a long time to execute.
*/
@@ -243,8 +302,11 @@ int __ps2_command(struct ps2dev *ps2dev, unsigned char *param, int command)
for (i = 0; i < receive; i++)
param[i] = ps2dev->cmdbuf[(receive - 1) - i];
- if (ps2dev->cmdcnt && (command != PS2_CMD_RESET_BAT || ps2dev->cmdcnt != 1))
+ if (ps2dev->cmdcnt &&
+ (command != PS2_CMD_RESET_BAT || ps2dev->cmdcnt != 1)) {
+ rc = -EPROTO;
goto out_reset_flags;
+ }
rc = 0;
@@ -252,11 +314,21 @@ int __ps2_command(struct ps2dev *ps2dev, unsigned char *param, int command)
ps2dev->flags = 0;
serio_continue_rx(ps2dev->serio);
- return rc;
+ dev_dbg(&ps2dev->serio->dev,
+ "%02x [%*ph] - %x/%08lx [%*ph]\n",
+ command & 0xff, send, send_param,
+ ps2dev->nak, ps2dev->flags,
+ receive, param ?: send_param);
+
+ /*
+ * ps_command() handles resends itself, so do not leak -EAGAIN
+ * to the callers.
+ */
+ return rc != -EAGAIN ? rc : -EPROTO;
}
EXPORT_SYMBOL(__ps2_command);
-int ps2_command(struct ps2dev *ps2dev, unsigned char *param, int command)
+int ps2_command(struct ps2dev *ps2dev, u8 *param, unsigned int command)
{
int rc;
@@ -269,6 +341,39 @@ int ps2_command(struct ps2dev *ps2dev, unsigned char *param, int command)
EXPORT_SYMBOL(ps2_command);
/*
+ * ps2_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 ps2_sliced_command(struct ps2dev *ps2dev, u8 command)
+{
+ int i;
+ int retval;
+
+ ps2_begin_command(ps2dev);
+
+ retval = __ps2_command(ps2dev, NULL, PS2_CMD_SETSCALE11);
+ if (retval)
+ goto out;
+
+ for (i = 6; i >= 0; i -= 2) {
+ u8 d = (command >> i) & 3;
+ retval = __ps2_command(ps2dev, &d, PS2_CMD_SETRES);
+ if (retval)
+ break;
+ }
+
+out:
+ dev_dbg(&ps2dev->serio->dev, "%02x - %d\n", command, retval);
+ ps2_end_command(ps2dev);
+ return retval;
+}
+EXPORT_SYMBOL(ps2_sliced_command);
+
+/*
* ps2_init() initializes ps2dev structure
*/
@@ -286,42 +391,53 @@ EXPORT_SYMBOL(ps2_init);
* to properly process ACK/NAK of a command from a PS/2 device.
*/
-int ps2_handle_ack(struct ps2dev *ps2dev, unsigned char data)
+bool ps2_handle_ack(struct ps2dev *ps2dev, u8 data)
{
switch (data) {
- case PS2_RET_ACK:
- ps2dev->nak = 0;
+ case PS2_RET_ACK:
+ ps2dev->nak = 0;
+ break;
+
+ case PS2_RET_NAK:
+ ps2dev->flags |= PS2_FLAG_NAK;
+ ps2dev->nak = PS2_RET_NAK;
+ break;
+
+ case PS2_RET_ERR:
+ if (ps2dev->flags & PS2_FLAG_NAK) {
+ ps2dev->flags &= ~PS2_FLAG_NAK;
+ ps2dev->nak = PS2_RET_ERR;
break;
+ }
- case PS2_RET_NAK:
- ps2dev->flags |= PS2_FLAG_NAK;
- ps2dev->nak = PS2_RET_NAK;
+ /*
+ * 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 (ps2dev->flags & PS2_FLAG_WAITID) {
+ ps2dev->nak = 0;
break;
-
- case PS2_RET_ERR:
- if (ps2dev->flags & PS2_FLAG_NAK) {
- ps2dev->flags &= ~PS2_FLAG_NAK;
- ps2dev->nak = PS2_RET_ERR;
- break;
- }
-
+ }
+ /* Fall through */
+ default:
/*
- * Workaround for mice which don't ACK the Get ID command.
- * These are valid mouse IDs that we recognize.
+ * Do not signal errors if we get unexpected reply while
+ * waiting for an ACK to the initial (first) command byte:
+ * the device might not be quiesced yet and continue
+ * delivering data.
+ * Note that we reset PS2_FLAG_WAITID flag, so the workaround
+ * for mice not acknowledging the Get ID command only triggers
+ * on the 1st byte; if device spews data we really want to see
+ * a real ACK from it.
*/
- case 0x00:
- case 0x03:
- case 0x04:
- if (ps2dev->flags & PS2_FLAG_WAITID) {
- ps2dev->nak = 0;
- break;
- }
- /* Fall through */
- default:
- return 0;
+ dev_dbg(&ps2dev->serio->dev, "unexpected %#02x\n", data);
+ ps2dev->flags &= ~PS2_FLAG_WAITID;
+ return ps2dev->flags & PS2_FLAG_ACK_CMD;
}
-
if (!ps2dev->nak) {
ps2dev->flags &= ~PS2_FLAG_NAK;
if (ps2dev->cmdcnt)
@@ -334,7 +450,7 @@ int ps2_handle_ack(struct ps2dev *ps2dev, unsigned char data)
if (data != PS2_RET_ACK)
ps2_handle_response(ps2dev, data);
- return 1;
+ return true;
}
EXPORT_SYMBOL(ps2_handle_ack);
@@ -344,7 +460,7 @@ EXPORT_SYMBOL(ps2_handle_ack);
* waiting for completion of the command.
*/
-int ps2_handle_response(struct ps2dev *ps2dev, unsigned char data)
+bool ps2_handle_response(struct ps2dev *ps2dev, u8 data)
{
if (ps2dev->cmdcnt)
ps2dev->cmdbuf[--ps2dev->cmdcnt] = data;
@@ -360,7 +476,7 @@ int ps2_handle_response(struct ps2dev *ps2dev, unsigned char data)
wake_up(&ps2dev->wait);
}
- return 1;
+ return true;
}
EXPORT_SYMBOL(ps2_handle_response);