Input: i8042 - export i8042_command()

[linux-2.6-omap-h63xx.git] / drivers / input / serio / i8042.c

diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
index db9cca3b65e068f4e22002ebab7d448a510d8eb0..1a0cea3c52945fca48aa363d2f636030d715ca77 100644 (file)
--- a/drivers/input/serio/i8042.c
+++ b/drivers/input/serio/i8042.c
@@ -20,6 +20,7 @@
 #include <linux/err.h>
 #include <linux/rcupdate.h>
 #include <linux/platform_device.h>
+#include <linux/i8042.h>
 
 #include <asm/io.h>
 
@@ -208,7 +209,7 @@ static int __i8042_command(unsigned char *param, int command)
        return 0;
 }
 
-static int i8042_command(unsigned char *param, int command)
+int i8042_command(unsigned char *param, int command)
 {
        unsigned long flags;
        int retval;
@@ -219,6 +220,7 @@ static int i8042_command(unsigned char *param, int command)
 
        return retval;
 }
+EXPORT_SYMBOL(i8042_command);
 
 /*
  * i8042_kbd_write() sends a byte out through the keyboard interface.
@@ -385,6 +387,8 @@ static int i8042_enable_kbd_port(void)
        i8042_ctr |= I8042_CTR_KBDINT;
 
        if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
+               i8042_ctr &= ~I8042_CTR_KBDINT;
+               i8042_ctr |= I8042_CTR_KBDDIS;
                printk(KERN_ERR "i8042.c: Failed to enable KBD port.\n");
                return -EIO;
        }
@@ -402,6 +406,8 @@ static int i8042_enable_aux_port(void)
        i8042_ctr |= I8042_CTR_AUXINT;
 
        if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
+               i8042_ctr &= ~I8042_CTR_AUXINT;
+               i8042_ctr |= I8042_CTR_AUXDIS;
                printk(KERN_ERR "i8042.c: Failed to enable AUX port.\n");
                return -EIO;
        }
@@ -512,6 +518,7 @@ static irqreturn_t __devinit i8042_aux_test_irq(int irq, void *dev_id)
 {
        unsigned long flags;
        unsigned char str, data;
+       int ret = 0;
 
        spin_lock_irqsave(&i8042_lock, flags);
        str = i8042_read_status();
@@ -520,12 +527,40 @@ static irqreturn_t __devinit i8042_aux_test_irq(int irq, void *dev_id)
                if (i8042_irq_being_tested &&
                    data == 0xa5 && (str & I8042_STR_AUXDATA))
                        complete(&i8042_aux_irq_delivered);
+               ret = 1;
        }
        spin_unlock_irqrestore(&i8042_lock, flags);
 
-       return IRQ_HANDLED;
+       return IRQ_RETVAL(ret);
 }
 
+/*
+ * i8042_toggle_aux - enables or disables AUX port on i8042 via command and
+ * verifies success by readinng CTR. Used when testing for presence of AUX
+ * port.
+ */
+static int __devinit i8042_toggle_aux(int on)
+{
+       unsigned char param;
+       int i;
+
+       if (i8042_command(&param,
+                       on ? I8042_CMD_AUX_ENABLE : I8042_CMD_AUX_DISABLE))
+               return -1;
+
+       /* some chips need some time to set the I8042_CTR_AUXDIS bit */
+       for (i = 0; i < 100; i++) {
+               udelay(50);
+
+               if (i8042_command(&param, I8042_CMD_CTL_RCTR))
+                       return -1;
+
+               if (!(param & I8042_CTR_AUXDIS) == on)
+                       return 0;
+       }
+
+       return -1;
+}
 
 /*
  * i8042_check_aux() applies as much paranoia as it can at detecting
@@ -580,16 +615,12 @@ static int __devinit i8042_check_aux(void)
  * Bit assignment test - filters out PS/2 i8042's in AT mode
  */
 
-       if (i8042_command(&param, I8042_CMD_AUX_DISABLE))
-               return -1;
-       if (i8042_command(&param, I8042_CMD_CTL_RCTR) || (~param & I8042_CTR_AUXDIS)) {
+       if (i8042_toggle_aux(0)) {
                printk(KERN_WARNING "Failed to disable AUX port, but continuing anyway... Is this a SiS?\n");
                printk(KERN_WARNING "If AUX port is really absent please use the 'i8042.noaux' option.\n");
        }
 
-       if (i8042_command(&param, I8042_CMD_AUX_ENABLE))
-               return -1;
-       if (i8042_command(&param, I8042_CMD_CTL_RCTR) || (param & I8042_CTR_AUXDIS))
+       if (i8042_toggle_aux(1))
                return -1;
 
 /*
@@ -767,6 +798,13 @@ static void i8042_controller_reset(void)
 {
        i8042_flush();
 
+/*
+ * Disable both KBD and AUX interfaces so they don't get in the way
+ */
+
+       i8042_ctr |= I8042_CTR_KBDDIS | I8042_CTR_AUXDIS;
+       i8042_ctr &= ~(I8042_CTR_KBDINT | I8042_CTR_AUXINT);
+
 /*
  * Disable MUX mode if present.
  */
@@ -1008,7 +1046,7 @@ static void __devinit i8042_register_ports(void)
        }
 }
 
-static void __devinit i8042_unregister_ports(void)
+static void __devexit i8042_unregister_ports(void)
 {
        int i;