X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=drivers%2Finput%2Fserio%2Fi8042.c;h=6440a8f55686de28141235cf80e3a72e2742d52a;hb=dd3f616d4b60a50328be152f66c93bd451461a39;hp=65a74cfc187b12199bb3f291775e9223da504198;hpb=d38501a379b7827a9bf916ba79d53f66c4ca7caa;p=safe%2Fjmp%2Flinux-2.6

diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
index 65a74cf..6440a8f 100644
--- a/drivers/input/serio/i8042.c
+++ b/drivers/input/serio/i8042.c
@@ -10,6 +10,7 @@
  * the Free Software Foundation.
  */
 
+#include <linux/types.h>
 #include <linux/delay.h>
 #include <linux/module.h>
 #include <linux/interrupt.h>
@@ -20,6 +21,7 @@
 #include <linux/rcupdate.h>
 #include <linux/platform_device.h>
 #include <linux/i8042.h>
+#include <linux/slab.h>
 
 #include <asm/io.h>
 
@@ -27,35 +29,35 @@ MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
 MODULE_DESCRIPTION("i8042 keyboard and mouse controller driver");
 MODULE_LICENSE("GPL");
 
-static unsigned int i8042_nokbd;
+static bool i8042_nokbd;
 module_param_named(nokbd, i8042_nokbd, bool, 0);
 MODULE_PARM_DESC(nokbd, "Do not probe or use KBD port.");
 
-static unsigned int i8042_noaux;
+static bool i8042_noaux;
 module_param_named(noaux, i8042_noaux, bool, 0);
 MODULE_PARM_DESC(noaux, "Do not probe or use AUX (mouse) port.");
 
-static unsigned int i8042_nomux;
+static bool i8042_nomux;
 module_param_named(nomux, i8042_nomux, bool, 0);
-MODULE_PARM_DESC(nomux, "Do not check whether an active multiplexing conrtoller is present.");
+MODULE_PARM_DESC(nomux, "Do not check whether an active multiplexing controller is present.");
 
-static unsigned int i8042_unlock;
+static bool i8042_unlock;
 module_param_named(unlock, i8042_unlock, bool, 0);
 MODULE_PARM_DESC(unlock, "Ignore keyboard lock.");
 
-static unsigned int i8042_reset;
+static bool i8042_reset;
 module_param_named(reset, i8042_reset, bool, 0);
 MODULE_PARM_DESC(reset, "Reset controller during init and cleanup.");
 
-static unsigned int i8042_direct;
+static bool i8042_direct;
 module_param_named(direct, i8042_direct, bool, 0);
 MODULE_PARM_DESC(direct, "Put keyboard port into non-translated mode.");
 
-static unsigned int i8042_dumbkbd;
+static bool i8042_dumbkbd;
 module_param_named(dumbkbd, i8042_dumbkbd, bool, 0);
 MODULE_PARM_DESC(dumbkbd, "Pretend that controller can only read data from keyboard");
 
-static unsigned int i8042_noloop;
+static bool i8042_noloop;
 module_param_named(noloop, i8042_noloop, bool, 0);
 MODULE_PARM_DESC(noloop, "Disable the AUX Loopback command while probing for the AUX port");
 
@@ -64,32 +66,48 @@ module_param_named(panicblink, i8042_blink_frequency, uint, 0600);
 MODULE_PARM_DESC(panicblink, "Frequency with which keyboard LEDs should blink when kernel panics");
 
 #ifdef CONFIG_X86
-static unsigned int i8042_dritek;
+static bool i8042_dritek;
 module_param_named(dritek, i8042_dritek, bool, 0);
 MODULE_PARM_DESC(dritek, "Force enable the Dritek keyboard extension");
 #endif
 
 #ifdef CONFIG_PNP
-static int i8042_nopnp;
+static bool i8042_nopnp;
 module_param_named(nopnp, i8042_nopnp, bool, 0);
 MODULE_PARM_DESC(nopnp, "Do not use PNP to detect controller settings");
 #endif
 
 #define DEBUG
 #ifdef DEBUG
-static int i8042_debug;
+static bool i8042_debug;
 module_param_named(debug, i8042_debug, bool, 0600);
 MODULE_PARM_DESC(debug, "Turn i8042 debugging mode on and off");
 #endif
 
+static bool i8042_bypass_aux_irq_test;
+
 #include "i8042.h"
 
+/*
+ * i8042_lock protects serialization between i8042_command and
+ * the interrupt handler.
+ */
 static DEFINE_SPINLOCK(i8042_lock);
 
+/*
+ * Writers to AUX and KBD ports as well as users issuing i8042_command
+ * directly should acquire i8042_mutex (by means of calling
+ * i8042_lock_chip() and i8042_unlock_ship() helpers) to ensure that
+ * they do not disturb each other (unfortunately in many i8042
+ * implementations write to one of the ports will immediately abort
+ * command that is being processed by another port).
+ */
+static DEFINE_MUTEX(i8042_mutex);
+
 struct i8042_port {
 	struct serio *serio;
 	int irq;
-	unsigned char exists;
+	bool exists;
 	signed char mux;
 };
 
@@ -102,13 +120,69 @@ static struct i8042_port i8042_ports[I8042_NUM_PORTS];
 
 static unsigned char i8042_initial_ctr;
 static unsigned char i8042_ctr;
-static unsigned char i8042_mux_present;
-static unsigned char i8042_kbd_irq_registered;
-static unsigned char i8042_aux_irq_registered;
+static bool i8042_mux_present;
+static bool i8042_kbd_irq_registered;
+static bool i8042_aux_irq_registered;
 static unsigned char i8042_suppress_kbd_ack;
 static struct platform_device *i8042_platform_device;
 
 static irqreturn_t i8042_interrupt(int irq, void *dev_id);
+static bool (*i8042_platform_filter)(unsigned char data, unsigned char str,
+				     struct serio *serio);
+
+void i8042_lock_chip(void)
+{
+	mutex_lock(&i8042_mutex);
+}
+EXPORT_SYMBOL(i8042_lock_chip);
+
+void i8042_unlock_chip(void)
+{
+	mutex_unlock(&i8042_mutex);
+}
+EXPORT_SYMBOL(i8042_unlock_chip);
+
+int i8042_install_filter(bool (*filter)(unsigned char data, unsigned char str,
+					struct serio *serio))
+{
+	unsigned long flags;
+	int ret = 0;
+
+	spin_lock_irqsave(&i8042_lock, flags);
+
+	if (i8042_platform_filter) {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	i8042_platform_filter = filter;
+
+out:
+	spin_unlock_irqrestore(&i8042_lock, flags);
+	return ret;
+}
+EXPORT_SYMBOL(i8042_install_filter);
+
+int i8042_remove_filter(bool (*filter)(unsigned char data, unsigned char str,
+				       struct serio *port))
+{
+	unsigned long flags;
+	int ret = 0;
+
+	spin_lock_irqsave(&i8042_lock, flags);
+
+	if (i8042_platform_filter != filter) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	i8042_platform_filter = NULL;
+
+out:
+	spin_unlock_irqrestore(&i8042_lock, flags);
+	return ret;
+}
+EXPORT_SYMBOL(i8042_remove_filter);
 
 /*
  * The i8042_wait_read() and i8042_wait_write functions wait for the i8042 to
@@ -261,6 +335,49 @@ static int i8042_aux_write(struct serio *serio, unsigned char c)
 					I8042_CMD_MUX_SEND + port->mux);
 }
 
+
+/*
+ * i8042_aux_close attempts to clear AUX or KBD port state by disabling
+ * and then re-enabling it.
+ */
+
+static void i8042_port_close(struct serio *serio)
+{
+	int irq_bit;
+	int disable_bit;
+	const char *port_name;
+
+	if (serio == i8042_ports[I8042_AUX_PORT_NO].serio) {
+		irq_bit = I8042_CTR_AUXINT;
+		disable_bit = I8042_CTR_AUXDIS;
+		port_name = "AUX";
+	} else {
+		irq_bit = I8042_CTR_KBDINT;
+		disable_bit = I8042_CTR_KBDDIS;
+		port_name = "KBD";
+	}
+
+	i8042_ctr &= ~irq_bit;
+	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
+		printk(KERN_WARNING
+			"i8042.c: Can't write CTR while closing %s port.\n",
+			port_name);
+
+	udelay(50);
+
+	i8042_ctr &= ~disable_bit;
+	i8042_ctr |= irq_bit;
+	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
+		printk(KERN_ERR "i8042.c: Can't reactivate %s port.\n",
+			port_name);
+
+	/*
+	 * See if there is any data appeared while we were messing with
+	 * port state.
+	 */
+	i8042_interrupt(0, NULL);
+}
+
 /*
  * i8042_start() is called by serio core when port is about to finish
  * registering. It will mark port as existing so i8042_interrupt can
@@ -270,7 +387,7 @@ static int i8042_start(struct serio *serio)
 {
 	struct i8042_port *port = serio->port_data;
 
-	port->exists = 1;
+	port->exists = true;
 	mb();
 	return 0;
 }
@@ -284,7 +401,7 @@ static void i8042_stop(struct serio *serio)
 {
 	struct i8042_port *port = serio->port_data;
 
-	port->exists = 0;
+	port->exists = false;
 
 	/*
 	 * We synchronize with both AUX and KBD IRQs because there is
@@ -297,6 +414,31 @@ static void i8042_stop(struct serio *serio)
 }
 
 /*
+ * i8042_filter() filters out unwanted bytes from the input data stream.
+ * It is called from i8042_interrupt and thus is running with interrupts
+ * off and i8042_lock held.
+ */
+static bool i8042_filter(unsigned char data, unsigned char str,
+			 struct serio *serio)
+{
+	if (unlikely(i8042_suppress_kbd_ack)) {
+		if ((~str & I8042_STR_AUXDATA) &&
+		    (data == 0xfa || data == 0xfe)) {
+			i8042_suppress_kbd_ack--;
+			dbg("Extra keyboard ACK - filtered out\n");
+			return true;
+		}
+	}
+
+	if (i8042_platform_filter && i8042_platform_filter(data, str, serio)) {
+		dbg("Filtered out by platform filter\n");
+		return true;
+	}
+
+	return false;
+}
+
+/*
  * i8042_interrupt() is the most important function in this driver -
  * it handles the interrupts from the i8042, and sends incoming bytes
  * to the upper layers.
@@ -305,13 +447,16 @@ static void i8042_stop(struct serio *serio)
 static irqreturn_t i8042_interrupt(int irq, void *dev_id)
 {
 	struct i8042_port *port;
+	struct serio *serio;
 	unsigned long flags;
 	unsigned char str, data;
 	unsigned int dfl;
 	unsigned int port_no;
+	bool filtered;
 	int ret = 1;
 
 	spin_lock_irqsave(&i8042_lock, flags);
+
 	str = i8042_read_status();
 	if (unlikely(~str & I8042_STR_OBF)) {
 		spin_unlock_irqrestore(&i8042_lock, flags);
@@ -319,8 +464,8 @@ static irqreturn_t i8042_interrupt(int irq, void *dev_id)
 		ret = 0;
 		goto out;
 	}
+
 	data = i8042_read_data();
-	spin_unlock_irqrestore(&i8042_lock, flags);
 
 	if (i8042_mux_present && (str & I8042_STR_AUXDATA)) {
 		static unsigned long last_transmit;
@@ -369,28 +514,26 @@ static irqreturn_t i8042_interrupt(int irq, void *dev_id)
 	}
 
 	port = &i8042_ports[port_no];
+	serio = port->exists ? port->serio : NULL;
 
 	dbg("%02x <- i8042 (interrupt, %d, %d%s%s)",
 	    data, port_no, irq,
 	    dfl & SERIO_PARITY ? ", bad parity" : "",
 	    dfl & SERIO_TIMEOUT ? ", timeout" : "");
 
-	if (unlikely(i8042_suppress_kbd_ack))
-		if (port_no == I8042_KBD_PORT_NO &&
-		    (data == 0xfa || data == 0xfe)) {
-			i8042_suppress_kbd_ack--;
-			goto out;
-		}
+	filtered = i8042_filter(data, str, serio);
+
+	spin_unlock_irqrestore(&i8042_lock, flags);
 
-	if (likely(port->exists))
-		serio_interrupt(port->serio, data, dfl);
+	if (likely(port->exists && !filtered))
+		serio_interrupt(serio, data, dfl);
 
  out:
 	return IRQ_RETVAL(ret);
 }
 
 /*
- * i8042_enable_kbd_port enables keybaord port on chip
+ * i8042_enable_kbd_port enables keyboard port on chip
  */
 
 static int i8042_enable_kbd_port(void)
@@ -446,14 +589,15 @@ static int i8042_enable_mux_ports(void)
 }
 
 /*
- * i8042_set_mux_mode checks whether the controller has an active
- * multiplexor and puts the chip into Multiplexed (1) or Legacy (0) mode.
+ * i8042_set_mux_mode checks whether the controller has an
+ * active multiplexor and puts the chip into Multiplexed (true)
+ * or Legacy (false) mode.
  */
 
-static int i8042_set_mux_mode(unsigned int mode, unsigned char *mux_version)
+static int i8042_set_mux_mode(bool multiplex, unsigned char *mux_version)
 {
 
-	unsigned char param;
+	unsigned char param, val;
 /*
  * Get rid of bytes in the queue.
  */
@@ -465,14 +609,21 @@ static int i8042_set_mux_mode(unsigned int mode, unsigned char *mux_version)
  * mouse interface, the last should be version.
  */
 
-	param = 0xf0;
-	if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param != 0xf0)
+	param = val = 0xf0;
+	if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param != val)
+		return -1;
+	param = val = multiplex ? 0x56 : 0xf6;
+	if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param != val)
 		return -1;
-	param = mode ? 0x56 : 0xf6;
-	if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param != (mode ? 0x56 : 0xf6))
+	param = val = multiplex ? 0xa4 : 0xa5;
+	if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param == val)
 		return -1;
-	param = mode ? 0xa4 : 0xa5;
-	if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param == (mode ? 0xa4 : 0xa5))
+
+/*
+ * Workaround for interference with USB Legacy emulation
+ * that causes a v10.12 MUX to be found.
+ */
+	if (param == 0xac)
 		return -1;
 
 	if (mux_version)
@@ -487,18 +638,11 @@ static int i8042_set_mux_mode(unsigned int mode, unsigned char *mux_version)
  * LCS/Telegraphics.
  */
 
-static int __devinit i8042_check_mux(void)
+static int __init i8042_check_mux(void)
 {
 	unsigned char mux_version;
 
-	if (i8042_set_mux_mode(1, &mux_version))
-		return -1;
-
-/*
- * Workaround for interference with USB Legacy emulation
- * that causes a v10.12 MUX to be found.
- */
-	if (mux_version == 0xAC)
+	if (i8042_set_mux_mode(true, &mux_version))
 		return -1;
 
 	printk(KERN_INFO "i8042.c: Detected active multiplexing controller, rev %d.%d.\n",
@@ -515,7 +659,7 @@ static int __devinit i8042_check_mux(void)
 		return -EIO;
 	}
 
-	i8042_mux_present = 1;
+	i8042_mux_present = true;
 
 	return 0;
 }
@@ -523,10 +667,10 @@ static int __devinit i8042_check_mux(void)
 /*
  * The following is used to test AUX IRQ delivery.
  */
-static struct completion i8042_aux_irq_delivered __devinitdata;
-static int i8042_irq_being_tested __devinitdata;
+static struct completion i8042_aux_irq_delivered __initdata;
+static bool i8042_irq_being_tested __initdata;
 
-static irqreturn_t __devinit i8042_aux_test_irq(int irq, void *dev_id)
+static irqreturn_t __init i8042_aux_test_irq(int irq, void *dev_id)
 {
 	unsigned long flags;
 	unsigned char str, data;
@@ -536,6 +680,8 @@ static irqreturn_t __devinit i8042_aux_test_irq(int irq, void *dev_id)
 	str = i8042_read_status();
 	if (str & I8042_STR_OBF) {
 		data = i8042_read_data();
+		dbg("%02x <- i8042 (aux_test_irq, %s)",
+			data, str & I8042_STR_AUXDATA ? "aux" : "kbd");
 		if (i8042_irq_being_tested &&
 		    data == 0xa5 && (str & I8042_STR_AUXDATA))
 			complete(&i8042_aux_irq_delivered);
@@ -551,7 +697,7 @@ static irqreturn_t __devinit i8042_aux_test_irq(int irq, void *dev_id)
  * verifies success by readinng CTR. Used when testing for presence of AUX
  * port.
  */
-static int __devinit i8042_toggle_aux(int on)
+static int __init i8042_toggle_aux(bool on)
 {
 	unsigned char param;
 	int i;
@@ -579,11 +725,11 @@ static int __devinit i8042_toggle_aux(int on)
  * the presence of an AUX interface.
  */
 
-static int __devinit i8042_check_aux(void)
+static int __init i8042_check_aux(void)
 {
 	int retval = -1;
-	int irq_registered = 0;
-	int aux_loop_broken = 0;
+	bool irq_registered = false;
+	bool aux_loop_broken = false;
 	unsigned long flags;
 	unsigned char param;
 
@@ -620,19 +766,19 @@ static int __devinit i8042_check_aux(void)
  * mark it as broken
  */
 		if (!retval)
-			aux_loop_broken = 1;
+			aux_loop_broken = true;
 	}
 
 /*
  * Bit assignment test - filters out PS/2 i8042's in AT mode
  */
 
-	if (i8042_toggle_aux(0)) {
+	if (i8042_toggle_aux(false)) {
 		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_toggle_aux(1))
+	if (i8042_toggle_aux(true))
 		return -1;
 
 /*
@@ -640,7 +786,7 @@ static int __devinit i8042_check_aux(void)
  * used it for a PCI card or somethig else.
  */
 
-	if (i8042_noloop || aux_loop_broken) {
+	if (i8042_noloop || i8042_bypass_aux_irq_test || aux_loop_broken) {
 /*
  * Without LOOP command we can't test AUX IRQ delivery. Assume the port
  * is working and hope we are right.
@@ -653,7 +799,7 @@ static int __devinit i8042_check_aux(void)
 			"i8042", i8042_platform_device))
 		goto out;
 
-	irq_registered = 1;
+	irq_registered = true;
 
 	if (i8042_enable_aux_port())
 		goto out;
@@ -661,7 +807,7 @@ static int __devinit i8042_check_aux(void)
 	spin_lock_irqsave(&i8042_lock, flags);
 
 	init_completion(&i8042_aux_irq_delivered);
-	i8042_irq_being_tested = 1;
+	i8042_irq_being_tested = true;
 
 	param = 0xa5;
 	retval = __i8042_command(&param, I8042_CMD_AUX_LOOP & 0xf0ff);
@@ -677,6 +823,7 @@ static int __devinit i8042_check_aux(void)
  * AUX IRQ was never delivered so we need to flush the controller to
  * get rid of the byte we put there; otherwise keyboard may not work.
  */
+		dbg("     -- i8042 (aux irq test timeout)");
 		i8042_flush();
 		retval = -1;
 	}
@@ -712,22 +859,43 @@ static int i8042_controller_check(void)
 static int i8042_controller_selftest(void)
 {
 	unsigned char param;
+	int i = 0;
 
 	if (!i8042_reset)
 		return 0;
 
-	if (i8042_command(&param, I8042_CMD_CTL_TEST)) {
-		printk(KERN_ERR "i8042.c: i8042 controller self test timeout.\n");
-		return -ENODEV;
-	}
+	/*
+	 * We try this 5 times; on some really fragile systems this does not
+	 * take the first time...
+	 */
+	do {
+
+		if (i8042_command(&param, I8042_CMD_CTL_TEST)) {
+			printk(KERN_ERR "i8042.c: i8042 controller self test timeout.\n");
+			return -ENODEV;
+		}
+
+		if (param == I8042_RET_CTL_TEST)
+			return 0;
 
-	if (param != I8042_RET_CTL_TEST) {
 		printk(KERN_ERR "i8042.c: i8042 controller selftest failed. (%#x != %#x)\n",
-			 param, I8042_RET_CTL_TEST);
-		return -EIO;
-	}
+			param, I8042_RET_CTL_TEST);
+		msleep(50);
+	} while (i++ < 5);
 
+#ifdef CONFIG_X86
+	/*
+	 * On x86, we don't fail entire i8042 initialization if controller
+	 * reset fails in hopes that keyboard port will still be functional
+	 * and user will still get a working keyboard. This is especially
+	 * important on netbooks. On other arches we trust hardware more.
+	 */
+	printk(KERN_INFO
+		"i8042: giving up on controller selftest, continuing anyway...\n");
 	return 0;
+#else
+	return -EIO;
+#endif
 }
 
 /*
@@ -739,17 +907,32 @@ static int i8042_controller_selftest(void)
 static int i8042_controller_init(void)
 {
 	unsigned long flags;
+	int n = 0;
+	unsigned char ctr[2];
 
 /*
- * Save the CTR for restoral on unload / reboot.
+ * Save the CTR for restore on unload / reboot.
  */
 
-	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_RCTR)) {
-		printk(KERN_ERR "i8042.c: Can't read CTR while initializing i8042.\n");
-		return -EIO;
-	}
+	do {
+		if (n >= 10) {
+			printk(KERN_ERR
+				"i8042.c: Unable to get stable CTR read.\n");
+			return -EIO;
+		}
 
-	i8042_initial_ctr = i8042_ctr;
+		if (n != 0)
+			udelay(50);
+
+		if (i8042_command(&ctr[n++ % 2], I8042_CMD_CTL_RCTR)) {
+			printk(KERN_ERR
+				"i8042.c: Can't read CTR while initializing i8042.\n");
+			return -EIO;
+		}
+
+	} while (n < 2 || ctr[0] != ctr[1]);
+
+	i8042_initial_ctr = i8042_ctr = ctr[0];
 
 /*
  * Disable the keyboard interface and interrupt.
@@ -777,7 +960,7 @@ static int i8042_controller_init(void)
  */
 
 	if (~i8042_ctr & I8042_CTR_XLATE)
-		i8042_direct = 1;
+		i8042_direct = true;
 
 /*
  * Set nontranslated mode for the kbd interface if requested by an option.
@@ -798,6 +981,12 @@ static int i8042_controller_init(void)
 		return -EIO;
 	}
 
+/*
+ * Flush whatever accumulated while we were disabling keyboard port.
+ */
+
+	i8042_flush();
+
 	return 0;
 }
 
@@ -817,12 +1006,15 @@ static void i8042_controller_reset(void)
 	i8042_ctr |= I8042_CTR_KBDDIS | I8042_CTR_AUXDIS;
 	i8042_ctr &= ~(I8042_CTR_KBDINT | I8042_CTR_AUXINT);
 
+	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
+		printk(KERN_WARNING "i8042.c: Can't write CTR while resetting.\n");
+
 /*
  * Disable MUX mode if present.
  */
 
 	if (i8042_mux_present)
-		i8042_set_mux_mode(0, NULL);
+		i8042_set_mux_mode(false, NULL);
 
 /*
  * Reset the controller if requested.
@@ -885,41 +1077,43 @@ static long i8042_panic_blink(long count)
 
 #undef DELAY
 
+#ifdef CONFIG_X86
+static void i8042_dritek_enable(void)
+{
+	char param = 0x90;
+	int error;
+
+	error = i8042_command(&param, 0x1059);
+	if (error)
+		printk(KERN_WARNING
+			"Failed to enable DRITEK extension: %d\n",
+			error);
+}
+#endif
+
 #ifdef CONFIG_PM
+
 /*
- * Here we try to restore the original BIOS settings. We only want to
- * do that once, when we really suspend, not when we taking memory
- * snapshot for swsusp (in this case we'll perform required cleanup
- * as part of shutdown process).
+ * Here we try to restore the original BIOS settings to avoid
+ * upsetting it.
  */
 
-static int i8042_suspend(struct platform_device *dev, pm_message_t state)
+static int i8042_pm_reset(struct device *dev)
 {
-	if (dev->dev.power.power_state.event != state.event) {
-		if (state.event == PM_EVENT_SUSPEND)
-			i8042_controller_reset();
-
-		dev->dev.power.power_state = state;
-	}
+	i8042_controller_reset();
 
 	return 0;
 }
 
-
 /*
- * Here we try to reset everything back to a state in which suspended
+ * Here we try to reset everything back to a state we had
+ * before suspending.
  */
 
-static int i8042_resume(struct platform_device *dev)
+static int i8042_pm_restore(struct device *dev)
 {
 	int error;
 
-/*
- * Do not bother with restoring state if we haven't suspened yet
- */
-	if (dev->dev.power.power_state.event == PM_EVENT_ON)
-		return 0;
-
 	error = i8042_controller_check();
 	if (error)
 		return error;
@@ -938,12 +1132,22 @@ static int i8042_resume(struct platform_device *dev)
 	i8042_ctr |= I8042_CTR_AUXDIS | I8042_CTR_KBDDIS;
 	i8042_ctr &= ~(I8042_CTR_AUXINT | I8042_CTR_KBDINT);
 	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
-		printk(KERN_ERR "i8042: Can't write CTR to resume\n");
-		return -EIO;
+		printk(KERN_WARNING "i8042: Can't write CTR to resume, retrying...\n");
+		msleep(50);
+		if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
+			printk(KERN_ERR "i8042: CTR write retry failed\n");
+			return -EIO;
+		}
 	}
 
+
+#ifdef CONFIG_X86
+	if (i8042_dritek)
+		i8042_dritek_enable();
+#endif
+
 	if (i8042_mux_present) {
-		if (i8042_set_mux_mode(1, NULL) || i8042_enable_mux_ports())
+		if (i8042_set_mux_mode(true, NULL) || i8042_enable_mux_ports())
 			printk(KERN_WARNING
 				"i8042: failed to resume active multiplexor, "
 				"mouse won't work.\n");
@@ -955,10 +1159,24 @@ static int i8042_resume(struct platform_device *dev)
 
 	i8042_interrupt(0, NULL);
 
-	dev->dev.power.power_state = PMSG_ON;
+	return 0;
+}
+
+static int i8042_pm_thaw(struct device *dev)
+{
+	i8042_interrupt(0, NULL);
 
 	return 0;
 }
+
+static const struct dev_pm_ops i8042_pm_ops = {
+	.suspend	= i8042_pm_reset,
+	.resume		= i8042_pm_restore,
+	.thaw		= i8042_pm_thaw,
+	.poweroff	= i8042_pm_reset,
+	.restore	= i8042_pm_restore,
+};
+
 #endif /* CONFIG_PM */
 
 /*
@@ -971,7 +1189,7 @@ static void i8042_shutdown(struct platform_device *dev)
 	i8042_controller_reset();
 }
 
-static int __devinit i8042_create_kbd_port(void)
+static int __init i8042_create_kbd_port(void)
 {
 	struct serio *serio;
 	struct i8042_port *port = &i8042_ports[I8042_KBD_PORT_NO];
@@ -984,6 +1202,7 @@ static int __devinit i8042_create_kbd_port(void)
 	serio->write		= i8042_dumbkbd ? NULL : i8042_kbd_write;
 	serio->start		= i8042_start;
 	serio->stop		= i8042_stop;
+	serio->close		= i8042_port_close;
 	serio->port_data	= port;
 	serio->dev.parent	= &i8042_platform_device->dev;
 	strlcpy(serio->name, "i8042 KBD port", sizeof(serio->name));
@@ -995,7 +1214,7 @@ static int __devinit i8042_create_kbd_port(void)
 	return 0;
 }
 
-static int __devinit i8042_create_aux_port(int idx)
+static int __init i8042_create_aux_port(int idx)
 {
 	struct serio *serio;
 	int port_no = idx < 0 ? I8042_AUX_PORT_NO : I8042_MUX_PORT_NO + idx;
@@ -1014,6 +1233,7 @@ static int __devinit i8042_create_aux_port(int idx)
 	if (idx < 0) {
 		strlcpy(serio->name, "i8042 AUX port", sizeof(serio->name));
 		strlcpy(serio->phys, I8042_AUX_PHYS_DESC, sizeof(serio->phys));
+		serio->close = i8042_port_close;
 	} else {
 		snprintf(serio->name, sizeof(serio->name), "i8042 AUX%d port", idx);
 		snprintf(serio->phys, sizeof(serio->phys), I8042_MUX_PHYS_DESC, idx + 1);
@@ -1026,13 +1246,13 @@ static int __devinit i8042_create_aux_port(int idx)
 	return 0;
 }
 
-static void __devinit i8042_free_kbd_port(void)
+static void __init i8042_free_kbd_port(void)
 {
 	kfree(i8042_ports[I8042_KBD_PORT_NO].serio);
 	i8042_ports[I8042_KBD_PORT_NO].serio = NULL;
 }
 
-static void __devinit i8042_free_aux_ports(void)
+static void __init i8042_free_aux_ports(void)
 {
 	int i;
 
@@ -1042,7 +1262,7 @@ static void __devinit i8042_free_aux_ports(void)
 	}
 }
 
-static void __devinit i8042_register_ports(void)
+static void __init i8042_register_ports(void)
 {
 	int i;
 
@@ -1070,6 +1290,21 @@ static void __devexit i8042_unregister_ports(void)
 	}
 }
 
+/*
+ * Checks whether port belongs to i8042 controller.
+ */
+bool i8042_check_port_owner(const struct serio *port)
+{
+	int i;
+
+	for (i = 0; i < I8042_NUM_PORTS; i++)
+		if (i8042_ports[i].serio == port)
+			return true;
+
+	return false;
+}
+EXPORT_SYMBOL(i8042_check_port_owner);
+
 static void i8042_free_irqs(void)
 {
 	if (i8042_aux_irq_registered)
@@ -1077,10 +1312,10 @@ static void i8042_free_irqs(void)
 	if (i8042_kbd_irq_registered)
 		free_irq(I8042_KBD_IRQ, i8042_platform_device);
 
-	i8042_aux_irq_registered = i8042_kbd_irq_registered = 0;
+	i8042_aux_irq_registered = i8042_kbd_irq_registered = false;
 }
 
-static int __devinit i8042_setup_aux(void)
+static int __init i8042_setup_aux(void)
 {
 	int (*aux_enable)(void);
 	int error;
@@ -1111,7 +1346,7 @@ static int __devinit i8042_setup_aux(void)
 	if (aux_enable())
 		goto err_free_irq;
 
-	i8042_aux_irq_registered = 1;
+	i8042_aux_irq_registered = true;
 	return 0;
 
  err_free_irq:
@@ -1121,7 +1356,7 @@ static int __devinit i8042_setup_aux(void)
 	return error;
 }
 
-static int __devinit i8042_setup_kbd(void)
+static int __init i8042_setup_kbd(void)
 {
 	int error;
 
@@ -1138,7 +1373,7 @@ static int __devinit i8042_setup_kbd(void)
 	if (error)
 		goto err_free_irq;
 
-	i8042_kbd_irq_registered = 1;
+	i8042_kbd_irq_registered = true;
 	return 0;
 
  err_free_irq:
@@ -1148,10 +1383,12 @@ static int __devinit i8042_setup_kbd(void)
 	return error;
 }
 
-static int __devinit i8042_probe(struct platform_device *dev)
+static int __init i8042_probe(struct platform_device *dev)
 {
 	int error;
 
+	i8042_platform_device = dev;
+
 	error = i8042_controller_selftest();
 	if (error)
 		return error;
@@ -1160,6 +1397,11 @@ static int __devinit i8042_probe(struct platform_device *dev)
 	if (error)
 		return error;
 
+#ifdef CONFIG_X86
+	if (i8042_dritek)
+		i8042_dritek_enable();
+#endif
+
 	if (!i8042_noaux) {
 		error = i8042_setup_aux();
 		if (error && error != -ENODEV && error != -EBUSY)
@@ -1171,14 +1413,6 @@ static int __devinit i8042_probe(struct platform_device *dev)
 		if (error)
 			goto out_fail;
 	}
-#ifdef CONFIG_X86
-	if (i8042_dritek) {
-		char param = 0x90;
-		error = i8042_command(&param, 0x1059);
-		if (error)
-			goto out_fail;
-	}
-#endif
 /*
  * Ok, everything is ready, let's register all serio ports
  */
@@ -1190,6 +1424,7 @@ static int __devinit i8042_probe(struct platform_device *dev)
 	i8042_free_aux_ports();	/* in case KBD failed but AUX not */
 	i8042_free_irqs();
 	i8042_controller_reset();
+	i8042_platform_device = NULL;
 
 	return error;
 }
@@ -1199,6 +1434,7 @@ static int __devexit i8042_remove(struct platform_device *dev)
 	i8042_unregister_ports();
 	i8042_free_irqs();
 	i8042_controller_reset();
+	i8042_platform_device = NULL;
 
 	return 0;
 }
@@ -1207,18 +1443,17 @@ static struct platform_driver i8042_driver = {
 	.driver		= {
 		.name	= "i8042",
 		.owner	= THIS_MODULE,
+#ifdef CONFIG_PM
+		.pm	= &i8042_pm_ops,
+#endif
 	},
-	.probe		= i8042_probe,
 	.remove		= __devexit_p(i8042_remove),
 	.shutdown	= i8042_shutdown,
-#ifdef CONFIG_PM
-	.suspend	= i8042_suspend,
-	.resume		= i8042_resume,
-#endif
 };
 
 static int __init i8042_init(void)
 {
+	struct platform_device *pdev;
 	int err;
 
 	dbg_init();
@@ -1231,38 +1466,25 @@ static int __init i8042_init(void)
 	if (err)
 		goto err_platform_exit;
 
-	err = platform_driver_register(&i8042_driver);
-	if (err)
+	pdev = platform_create_bundle(&i8042_driver, i8042_probe, NULL, 0, NULL, 0);
+	if (IS_ERR(pdev)) {
+		err = PTR_ERR(pdev);
 		goto err_platform_exit;
-
-	i8042_platform_device = platform_device_alloc("i8042", -1);
-	if (!i8042_platform_device) {
-		err = -ENOMEM;
-		goto err_unregister_driver;
 	}
 
-	err = platform_device_add(i8042_platform_device);
-	if (err)
-		goto err_free_device;
-
 	panic_blink = i8042_panic_blink;
 
 	return 0;
 
- err_free_device:
-	platform_device_put(i8042_platform_device);
- err_unregister_driver:
-	platform_driver_unregister(&i8042_driver);
  err_platform_exit:
 	i8042_platform_exit();
-
 	return err;
 }
 
 static void __exit i8042_exit(void)
 {
-	platform_device_unregister(i8042_platform_device);
 	platform_driver_unregister(&i8042_driver);
+	platform_device_unregister(i8042_platform_device);
 	i8042_platform_exit();
 
 	panic_blink = NULL;