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Subject[patch 22/24] i8042 - dont use negation in i8042_command()
Input: i8042 - don't use negation to mark AUX data

Currently i8042_command() negates data coming from the AUX port
of keyboard controller; this is not a very reliable indicator.
Change i8042_command() to fail if response to I8042_CMD_AUX_LOOP
is not coming from AUX channel and get rid of negation.

Based on patch by Vojtech Pavlik.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
---

drivers/input/serio/i8042.c | 62 +++++++++++++++++++++++---------------------
1 files changed, 33 insertions(+), 29 deletions(-)

Index: work/drivers/input/serio/i8042.c
===================================================================
--- work.orig/drivers/input/serio/i8042.c
+++ work/drivers/input/serio/i8042.c
@@ -100,7 +100,7 @@ struct i8042_port {
static struct i8042_port i8042_ports[I8042_NUM_PORTS] = {
{
.disable = I8042_CTR_KBDDIS,
- .irqen = I8042_CTR_KBDINT,
+ .irqen = I8042_CTR_KBDINT,
.mux = -1,
.name = "KBD",
},
@@ -191,41 +191,45 @@ static int i8042_flush(void)
static int i8042_command(unsigned char *param, int command)
{
unsigned long flags;
- int retval = 0, i = 0;
+ int i, retval, auxerr = 0;

if (i8042_noloop && command == I8042_CMD_AUX_LOOP)
return -1;

spin_lock_irqsave(&i8042_lock, flags);

- retval = i8042_wait_write();
- if (!retval) {
- dbg("%02x -> i8042 (command)", command & 0xff);
- i8042_write_command(command & 0xff);
- }
+ if ((retval = i8042_wait_write()))
+ goto out;

- if (!retval)
- for (i = 0; i < ((command >> 12) & 0xf); i++) {
- if ((retval = i8042_wait_write())) break;
- dbg("%02x -> i8042 (parameter)", param[i]);
- i8042_write_data(param[i]);
- }
+ dbg("%02x -> i8042 (command)", command & 0xff);
+ i8042_write_command(command & 0xff);

- if (!retval)
- for (i = 0; i < ((command >> 8) & 0xf); i++) {
- if ((retval = i8042_wait_read())) break;
- if (i8042_read_status() & I8042_STR_AUXDATA)
- param[i] = ~i8042_read_data();
- else
- param[i] = i8042_read_data();
- dbg("%02x <- i8042 (return)", param[i]);
+ for (i = 0; i < ((command >> 12) & 0xf); i++) {
+ if ((retval = i8042_wait_write()))
+ goto out;
+ dbg("%02x -> i8042 (parameter)", param[i]);
+ i8042_write_data(param[i]);
+ }
+
+ for (i = 0; i < ((command >> 8) & 0xf); i++) {
+ if ((retval = i8042_wait_read()))
+ goto out;
+
+ if (command == I8042_CMD_AUX_LOOP &&
+ !(i8042_read_status() & I8042_STR_AUXDATA)) {
+ retval = auxerr = -1;
+ goto out;
}

- spin_unlock_irqrestore(&i8042_lock, flags);
+ param[i] = i8042_read_data();
+ dbg("%02x <- i8042 (return)", param[i]);
+ }

if (retval)
- dbg(" -- i8042 (timeout)");
+ dbg(" -- i8042 (%s)", auxerr ? "auxerr" : "timeout");

+ out:
+ spin_unlock_irqrestore(&i8042_lock, flags);
return retval;
}

@@ -507,17 +511,17 @@ static int i8042_set_mux_mode(unsigned i
*/

param = 0xf0;
- if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param != 0x0f)
+ if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param != 0xf0)
return -1;
param = mode ? 0x56 : 0xf6;
- if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param != (mode ? 0xa9 : 0x09))
+ if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param != (mode ? 0x56 : 0xf6))
return -1;
param = mode ? 0xa4 : 0xa5;
- if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param == (mode ? 0x5b : 0x5a))
+ if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param == (mode ? 0xa4 : 0xa5))
return -1;

if (mux_version)
- *mux_version = ~param;
+ *mux_version = param;

return 0;
}
@@ -619,7 +623,7 @@ static int __init i8042_check_aux(void)
*/

param = 0x5a;
- if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param != 0xa5) {
+ if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param != 0x5a) {

/*
* External connection test - filters out AT-soldered PS/2 i8042's
@@ -630,7 +634,7 @@ static int __init i8042_check_aux(void)
*/

if (i8042_command(&param, I8042_CMD_AUX_TEST)
- || (param && param != 0xfa && param != 0xff))
+ || (param && param != 0xfa && param != 0xff))
return -1;
}

-
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