Release 4.11 drivers/input/serio/i8042.c

/*
 *  i8042 keyboard and mouse controller driver for Linux
 *
 *  Copyright (c) 1999-2004 Vojtech Pavlik
 */

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/types.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/serio.h>
#include <linux/err.h>
#include <linux/rcupdate.h>
#include <linux/platform_device.h>
#include <linux/i8042.h>
#include <linux/slab.h>
#include <linux/suspend.h>

#include <asm/io.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
MODULE_DESCRIPTION("i8042 keyboard and mouse controller driver");
MODULE_LICENSE("GPL");


static bool i8042_nokbd;
module_param_named(nokbd, i8042_nokbd, bool, 0);
MODULE_PARM_DESC(nokbd, "Do not probe or use KBD port.");


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 bool i8042_nomux;
module_param_named(nomux, i8042_nomux, bool, 0);
MODULE_PARM_DESC(nomux, "Do not check whether an active multiplexing controller is present.");


static bool i8042_unlock;
module_param_named(unlock, i8042_unlock, bool, 0);
MODULE_PARM_DESC(unlock, "Ignore keyboard lock.");


enum i8042_controller_reset_mode {
	
I8042_RESET_NEVER,
	
I8042_RESET_ALWAYS,
	
I8042_RESET_ON_S2RAM,

#define I8042_RESET_DEFAULT	I8042_RESET_ON_S2RAM
};

static enum i8042_controller_reset_mode i8042_reset = I8042_RESET_DEFAULT;


static int i8042_set_reset(const char *val, const struct kernel_param *kp)
{
	enum i8042_controller_reset_mode *arg = kp->arg;
	int error;
	bool reset;

	if (val) {
		error = kstrtobool(val, &reset);
		if (error)
			return error;
	} else {
		reset = true;
	}

	*arg = reset ? I8042_RESET_ALWAYS : I8042_RESET_NEVER;
	return 0;
}

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static const struct kernel_param_ops param_ops_reset_param = {
	.flags = KERNEL_PARAM_OPS_FL_NOARG,
	.set = i8042_set_reset,
};

#define param_check_reset_param(name, p)	\
	__param_check(name, p, enum i8042_controller_reset_mode)
module_param_named(reset, i8042_reset, reset_param, 0);
MODULE_PARM_DESC(reset, "Reset controller on resume, cleanup or both");


static bool i8042_direct;
module_param_named(direct, i8042_direct, bool, 0);
MODULE_PARM_DESC(direct, "Put keyboard port into non-translated mode.");


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 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");


static bool i8042_notimeout;
module_param_named(notimeout, i8042_notimeout, bool, 0);
MODULE_PARM_DESC(notimeout, "Ignore timeouts signalled by i8042");


static bool i8042_kbdreset;
module_param_named(kbdreset, i8042_kbdreset, bool, 0);
MODULE_PARM_DESC(kbdreset, "Reset device connected to KBD port");

#ifdef CONFIG_X86

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 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 bool i8042_debug;
module_param_named(debug, i8042_debug, bool, 0600);
MODULE_PARM_DESC(debug, "Turn i8042 debugging mode on and off");


static bool i8042_unmask_kbd_data;
module_param_named(unmask_kbd_data, i8042_unmask_kbd_data, bool, 0600);
MODULE_PARM_DESC(unmask_kbd_data, "Unconditional enable (may reveal sensitive data) of normally sanitize-filtered kbd data traffic debug log [pre-condition: i8042.debug=1 enabled]");
#endif


static bool i8042_bypass_aux_irq_test;

static char i8042_kbd_firmware_id[128];

static char i8042_aux_firmware_id[128];

#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;
	
bool exists;
	
bool driver_bound;
	
signed char mux;
};


#define I8042_KBD_PORT_NO	0

#define I8042_AUX_PORT_NO	1

#define I8042_MUX_PORT_NO	2

#define I8042_NUM_PORTS		(I8042_NUM_MUX_PORTS + 2)


static struct i8042_port i8042_ports[I8042_NUM_PORTS];


static unsigned char i8042_initial_ctr;

static unsigned char i8042_ctr;

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 struct notifier_block i8042_kbd_bind_notifier_block;

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);
}
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EXPORT_SYMBOL(i8042_lock_chip);



void i8042_unlock_chip(void)
{
	mutex_unlock(&i8042_mutex);
}
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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;
}
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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;
}
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EXPORT_SYMBOL(i8042_remove_filter);

/*
 * The i8042_wait_read() and i8042_wait_write functions wait for the i8042 to
 * be ready for reading values from it / writing values to it.
 * Called always with i8042_lock held.
 */



static int i8042_wait_read(void)
{
	int i = 0;

	while ((~i8042_read_status() & I8042_STR_OBF) && (i < I8042_CTL_TIMEOUT)) {
		udelay(50);
		i++;
	}
	return -(i == I8042_CTL_TIMEOUT);
}

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static int i8042_wait_write(void)
{
	int i = 0;

	while ((i8042_read_status() & I8042_STR_IBF) && (i < I8042_CTL_TIMEOUT)) {
		udelay(50);
		i++;
	}
	return -(i == I8042_CTL_TIMEOUT);
}

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/*
 * i8042_flush() flushes all data that may be in the keyboard and mouse buffers
 * of the i8042 down the toilet.
 */



static int i8042_flush(void)
{
	unsigned long flags;
	unsigned char data, str;
	int count = 0;
	int retval = 0;

	spin_lock_irqsave(&i8042_lock, flags);

	while ((str = i8042_read_status()) & I8042_STR_OBF) {
		if (count++ < I8042_BUFFER_SIZE) {
			udelay(50);
			data = i8042_read_data();
			dbg("%02x <- i8042 (flush, %s)\n",
			    data, str & I8042_STR_AUXDATA ? "aux" : "kbd");
		} else {
			retval = -EIO;
			break;
		}
	}

	spin_unlock_irqrestore(&i8042_lock, flags);

	return retval;
}

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/*
 * i8042_command() executes a command on the i8042. It also sends the input
 * parameter(s) of the commands to it, and receives the output value(s). The
 * parameters are to be stored in the param array, and the output is placed
 * into the same array. The number of the parameters and output values is
 * encoded in bits 8-11 of the command number.
 */



static int __i8042_command(unsigned char *param, int command)
{
	int i, error;

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

	error = i8042_wait_write();
	if (error)
		return error;

	dbg("%02x -> i8042 (command)\n", command & 0xff);
	i8042_write_command(command & 0xff);

	for (i = 0; i < ((command >> 12) & 0xf); i++) {
		error = i8042_wait_write();
		if (error) {
			dbg("     -- i8042 (wait write timeout)\n");
			return error;
		}
		dbg("%02x -> i8042 (parameter)\n", param[i]);
		i8042_write_data(param[i]);
	}

	for (i = 0; i < ((command >> 8) & 0xf); i++) {
		error = i8042_wait_read();
		if (error) {
			dbg("     -- i8042 (wait read timeout)\n");
			return error;
		}

		if (command == I8042_CMD_AUX_LOOP &&
		    !(i8042_read_status() & I8042_STR_AUXDATA)) {
			dbg("     -- i8042 (auxerr)\n");
			return -1;
		}

		param[i] = i8042_read_data();
		dbg("%02x <- i8042 (return)\n", param[i]);
	}

	return 0;
}

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int i8042_command(unsigned char *param, int command)
{
	unsigned long flags;
	int retval;

	spin_lock_irqsave(&i8042_lock, flags);
	retval = __i8042_command(param, command);
	spin_unlock_irqrestore(&i8042_lock, flags);

	return retval;
}
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EXPORT_SYMBOL(i8042_command);

/*
 * i8042_kbd_write() sends a byte out through the keyboard interface.
 */



static int i8042_kbd_write(struct serio *port, unsigned char c)
{
	unsigned long flags;
	int retval = 0;

	spin_lock_irqsave(&i8042_lock, flags);

	if (!(retval = i8042_wait_write())) {
		dbg("%02x -> i8042 (kbd-data)\n", c);
		i8042_write_data(c);
	}

	spin_unlock_irqrestore(&i8042_lock, flags);

	return retval;
}

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/*
 * i8042_aux_write() sends a byte out through the aux interface.
 */



static int i8042_aux_write(struct serio *serio, unsigned char c)
{
	struct i8042_port *port = serio->port_data;

	return i8042_command(&c, port->mux == -1 ?
					I8042_CMD_AUX_SEND :
					I8042_CMD_MUX_SEND + port->mux);
}


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/*
 * i8042_port_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))
		pr_warn("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))
		pr_err("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);
}

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/*
 * i8042_start() is called by serio core when port is about to finish
 * registering. It will mark port as existing so i8042_interrupt can
 * start sending data through it.
 */


static int i8042_start(struct serio *serio)
{
	struct i8042_port *port = serio->port_data;

	port->exists = true;
	mb();
	return 0;
}

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/*
 * i8042_stop() marks serio port as non-existing so i8042_interrupt
 * will not try to send data to the port that is about to go away.
 * The function is called by serio core as part of unregister procedure.
 */


static void i8042_stop(struct serio *serio)
{
	struct i8042_port *port = serio->port_data;

	port->exists = false;

	/*
         * We synchronize with both AUX and KBD IRQs because there is
         * a (very unlikely) chance that AUX IRQ is raised for KBD port
         * and vice versa.
         */
	synchronize_irq(I8042_AUX_IRQ);
	synchronize_irq(I8042_KBD_IRQ);
	port->serio = NULL;
}

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/*
 * 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;
}

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/*
 * 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.
 */



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);
		if (irq)
			dbg("Interrupt %d, without any data\n", irq);
		ret = 0;
		goto out;
	}

	data = i8042_read_data();

	if (i8042_mux_present && (str & I8042_STR_AUXDATA)) {
		static unsigned long last_transmit;
		static unsigned char last_str;

		dfl = 0;
		if (str & I8042_STR_MUXERR) {
			dbg("MUX error, status is %02x, data is %02x\n",
			    str, data);
/*
 * When MUXERR condition is signalled the data register can only contain
 * 0xfd, 0xfe or 0xff if implementation follows the spec. Unfortunately
 * it is not always the case. Some KBCs also report 0xfc when there is
 * nothing connected to the port while others sometimes get confused which
 * port the data came from and signal error leaving the data intact. They
 * _do not_ revert to legacy mode (actually I've never seen KBC reverting
 * to legacy mode yet, when we see one we'll add proper handling).
 * Anyway, we process 0xfc, 0xfd, 0xfe and 0xff as timeouts, and for the
 * rest assume that the data came from the same serio last byte
 * was transmitted (if transmission happened not too long ago).
 */

			switch (data) {
				default:
					if (time_before(jiffies, last_transmit + HZ/10)) {
						str = last_str;
						break;
					}
					/* fall through - report timeout */
				case 0xfc:
				case 0xfd:
				case 0xfe: dfl = SERIO_TIMEOUT; data = 0xfe; break;
				case 0xff: dfl = SERIO_PARITY;  data = 0xfe; break;
			}
		}

		port_no = I8042_MUX_PORT_NO + ((str >> 6) & 3);
		last_str = str;
		last_transmit = jiffies;
	} else {

		dfl = ((str & I8042_STR_PARITY) ? SERIO_PARITY : 0) |
		      ((str & I8042_STR_TIMEOUT && !i8042_notimeout) ? SERIO_TIMEOUT : 0);

		port_no = (str & I8042_STR_AUXDATA) ?
				I8042_AUX_PORT_NO : I8042_KBD_PORT_NO;
	}

	port = &i8042_ports[port_no];
	serio = port->exists ? port->serio : NULL;

	filter_dbg(port->driver_bound, data, "<- i8042 (interrupt, %d, %d%s%s)\n",
		   port_no, irq,
		   dfl & SERIO_PARITY ? ", bad parity" : "",
		   dfl & SERIO_TIMEOUT ? ", timeout" : "");

	filtered = i8042_filter(data, str, serio);

	spin_unlock_irqrestore(&i8042_lock, flags);

	if (likely(port->exists && !filtered))
		serio_interrupt(serio, data, dfl);

 out:
	return IRQ_RETVAL(ret);
}

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/*
 * i8042_enable_kbd_port enables keyboard port on chip
 */



static int i8042_enable_kbd_port(void)
{
	i8042_ctr &= ~I8042_CTR_KBDDIS;
	i8042_ctr |= I8042_CTR_KBDINT;

	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
		i8042_ctr &= ~I8042_CTR_KBDINT;
		i8042_ctr |= I8042_CTR_KBDDIS;
		pr_err("Failed to enable KBD port\n");
		return -EIO;
	}

	return 0;
}

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/*
 * i8042_enable_aux_port enables AUX (mouse) port on chip
 */



static int i8042_enable_aux_port(void)
{
	i8042_ctr &= ~I8042_CTR_AUXDIS;
	i8042_ctr |= I8042_CTR_AUXINT;

	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
		i8042_ctr &= ~I8042_CTR_AUXINT;
		i8042_ctr |= I8042_CTR_AUXDIS;
		pr_err("Failed to enable AUX port\n");
		return -EIO;
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
39
78.00%
1
33.33%
Markus Armbruster
9
18.00%
1
33.33%
Joe Perches
2
4.00%
1
33.33%
Total
50
100.00%
3
100.00%

/*
 * i8042_enable_mux_ports enables 4 individual AUX ports after
 * the controller has been switched into Multiplexed mode
 */



static int i8042_enable_mux_ports(void)
{
	unsigned char param;
	int i;

	for (i = 0; i < I8042_NUM_MUX_PORTS; i++) {
		i8042_command(&param, I8042_CMD_MUX_PFX + i);
		i8042_command(&param, I8042_CMD_AUX_ENABLE);
	}

	return i8042_enable_aux_port();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
52
100.00%
1
100.00%
Total
52
100.00%
1
100.00%

/*
 * 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(bool multiplex, unsigned char *mux_version)
{

	unsigned char param, val;
/*
 * Get rid of bytes in the queue.
 */

	i8042_flush();

/*
 * Internal loopback test - send three bytes, they should come back from the
 * mouse interface, the last should be version.
 */

	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 = val = multiplex ? 0xa4 : 0xa5;
	if (i8042_command(&param, I8042_CMD_AUX_LOOP) || param == val)
		return -1;

/*
 * Workaround for interference with USB Legacy emulation
 * that causes a v10.12 MUX to be found.
 */
	if (param == 0xac)
		return -1;

	if (mux_version)
		*mux_version = param;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
80
62.50%
3
60.00%
Vojtech Pavlik
48
37.50%
2
40.00%
Total
128
100.00%
5
100.00%

/*
 * i8042_check_mux() checks whether the controller supports the PS/2 Active
 * Multiplexing specification by Synaptics, Phoenix, Insyde and
 * LCS/Telegraphics.
 */



static int __init i8042_check_mux(void)
{
	unsigned char mux_version;

	if (i8042_set_mux_mode(true, &mux_version))
		return -1;

	pr_info("Detected active multiplexing controller, rev %d.%d\n",
		(mux_version >> 4) & 0xf, mux_version & 0xf);

/*
 * Disable all muxed ports by disabling AUX.
 */
	i8042_ctr |= I8042_CTR_AUXDIS;
	i8042_ctr &= ~I8042_CTR_AUXINT;

	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
		pr_err("Failed to disable AUX port, can't use MUX\n");
		return -EIO;
	}

	i8042_mux_present = true;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Vojtech Pavlik
44
53.66%
4
40.00%
Dmitry Torokhov
34
41.46%
5
50.00%
Joe Perches
4
4.88%
1
10.00%
Total
82
100.00%
10
100.00%

/*
 * The following is used to test AUX IRQ delivery.
 */

static struct completion i8042_aux_irq_delivered __initdata;

static bool i8042_irq_being_tested __initdata;



static irqreturn_t __init 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();
	if (str & I8042_STR_OBF) {
		data = i8042_read_data();
		dbg("%02x <- i8042 (aux_test_irq, %s)\n",
		    data, str & I8042_STR_AUXDATA ? "aux" : "kbd");
		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_RETVAL(ret);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
79
73.15%
4
44.44%
Fernando Luis Vázquez Cao
13
12.04%
1
11.11%
Vojtech Pavlik
12
11.11%
2
22.22%
Andrew Morton
3
2.78%
1
11.11%
Joe Perches
1
0.93%
1
11.11%
Total
108
100.00%
9
100.00%

/*
 * 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 __init i8042_toggle_aux(bool 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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Roland Scheidegger
86
97.73%
1
33.33%
Dmitry Torokhov
2
2.27%
2
66.67%
Total
88
100.00%
3
100.00%

/*
 * i8042_check_aux() applies as much paranoia as it can at detecting
 * the presence of an AUX interface.
 */



static int __init i8042_check_aux(void)
{
	int retval = -1;
	bool irq_registered = false;
	bool aux_loop_broken = false;
	unsigned long flags;
	unsigned char param;

/*
 * Get rid of bytes in the queue.
 */

	i8042_flush();

/*
 * Internal loopback test - filters out AT-type i8042's. Unfortunately
 * SiS screwed up and their 5597 doesn't support the LOOP command even
 * though it has an AUX port.
 */

	param = 0x5a;
	retval = i8042_command(&param, I8042_CMD_AUX_LOOP);
	if (retval || param != 0x5a) {

/*
 * External connection test - filters out AT-soldered PS/2 i8042's
 * 0x00 - no error, 0x01-0x03 - clock/data stuck, 0xff - general error
 * 0xfa - no error on some notebooks which ignore the spec
 * Because it's common for chipsets to return error on perfectly functioning
 * AUX ports, we test for this only when the LOOP command failed.
 */

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

/*
 * If AUX_LOOP completed without error but returned unexpected data
 * mark it as broken
 */
		if (!retval)
			aux_loop_broken = true;
	}

/*
 * Bit assignment test - filters out PS/2 i8042's in AT mode
 */

	if (i8042_toggle_aux(false)) {
		pr_warn("Failed to disable AUX port, but continuing anyway... Is this a SiS?\n");
		pr_warn("If AUX port is really absent please use the 'i8042.noaux' option\n");
	}

	if (i8042_toggle_aux(true))
		return -1;

/*
 * Reset keyboard (needed on some laptops to successfully detect
 * touchpad, e.g., some Gigabyte laptop models with Elantech
 * touchpads).
 */
	if (i8042_kbdreset) {
		pr_warn("Attempting to reset device connected to KBD port\n");
		i8042_kbd_write(NULL, (unsigned char) 0xff);
	}

/*
 * Test AUX IRQ delivery to make sure BIOS did not grab the IRQ and
 * used it for a PCI card or somethig else.
 */

	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.
 */
		retval = 0;
		goto out;
	}

	if (request_irq(I8042_AUX_IRQ, i8042_aux_test_irq, IRQF_SHARED,
			"i8042", i8042_platform_device))
		goto out;

	irq_registered = true;

	if (i8042_enable_aux_port())
		goto out;

	spin_lock_irqsave(&i8042_lock, flags);

	init_completion(&i8042_aux_irq_delivered);
	i8042_irq_being_tested = true;

	param = 0xa5;
	retval = __i8042_command(&param, I8042_CMD_AUX_LOOP & 0xf0ff);

	spin_unlock_irqrestore(&i8042_lock, flags);

	if (retval)
		goto out;

	if (wait_for_completion_timeout(&i8042_aux_irq_delivered,
					msecs_to_jiffies(250)) == 0) {
/*
 * 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)\n");
		i8042_flush();
		retval = -1;
	}

 out:

/*
 * Disable the interface.
 */

	i8042_ctr |= I8042_CTR_AUXDIS;
	i8042_ctr &= ~I8042_CTR_AUXINT;

	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
		retval = -1;

	if (irq_registered)
		free_irq(I8042_AUX_IRQ, i8042_platform_device);

	return retval;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
194
60.06%
10
47.62%
Vojtech Pavlik
89
27.55%
6
28.57%
Srihari Vijayaraghavan
23
7.12%
1
4.76%
Andrew Morton
9
2.79%
1
4.76%
Joe Perches
4
1.24%
1
4.76%
Roland Scheidegger
2
0.62%
1
4.76%
Peter Berg Larsen
2
0.62%
1
4.76%
Total
323
100.00%
21
100.00%



static int i8042_controller_check(void)
{
	if (i8042_flush()) {
		pr_info("No controller found\n");
		return -ENODEV;
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
17
62.96%
1
25.00%
Vojtech Pavlik
8
29.63%
1
25.00%
Joe Perches
1
3.70%
1
25.00%
Takashi Iwai
1
3.70%
1
25.00%
Total
27
100.00%
4
100.00%



static int i8042_controller_selftest(void)
{
	unsigned char param;
	int i = 0;

	/*
         * 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)) {
			pr_err("i8042 controller selftest timeout\n");
			return -ENODEV;
		}

		if (param == I8042_RET_CTL_TEST)
			return 0;

		dbg("i8042 controller selftest: %#x != %#x\n",
		    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.
         */
	pr_info("giving up on controller selftest, continuing anyway...\n");
	return 0;
#else
	pr_err("i8042 controller selftest failed\n");
	return -EIO;
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Arjan van de Ven
40
40.82%
1
10.00%
Dmitry Torokhov
29
29.59%
2
20.00%
Vojtech Pavlik
18
18.37%
5
50.00%
Paul Bolle
8
8.16%
1
10.00%
Joe Perches
3
3.06%
1
10.00%
Total
98
100.00%
10
100.00%

/*
 * i8042_controller init initializes the i8042 controller, and,
 * most importantly, sets it into non-xlated mode if that's
 * desired.
 */



static int i8042_controller_init(void)
{
	unsigned long flags;
	int n = 0;
	unsigned char ctr[2];

/*
 * Save the CTR for restore on unload / reboot.
 */

	do {
		if (n >= 10) {
			pr_err("Unable to get stable CTR read\n");
			return -EIO;
		}

		if (n != 0)
			udelay(50);

		if (i8042_command(&ctr[n++ % 2], I8042_CMD_CTL_RCTR)) {
			pr_err("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.
 */

	i8042_ctr |= I8042_CTR_KBDDIS;
	i8042_ctr &= ~I8042_CTR_KBDINT;

/*
 * Handle keylock.
 */

	spin_lock_irqsave(&i8042_lock, flags);
	if (~i8042_read_status() & I8042_STR_KEYLOCK) {
		if (i8042_unlock)
			i8042_ctr |= I8042_CTR_IGNKEYLOCK;
		else
			pr_warn("Warning: Keylock active\n");
	}
	spin_unlock_irqrestore(&i8042_lock, flags);

/*
 * If the chip is configured into nontranslated mode by the BIOS, don't
 * bother enabling translating and be happy.
 */

	if (~i8042_ctr & I8042_CTR_XLATE)
		i8042_direct = true;

/*
 * Set nontranslated mode for the kbd interface if requested by an option.
 * After this the kbd interface becomes a simple serial in/out, like the aux
 * interface is. We don't do this by default, since it can confuse notebook
 * BIOSes.
 */

	if (i8042_direct)
		i8042_ctr &= ~I8042_CTR_XLATE;

/*
 * Write CTR back.
 */

	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
		pr_err("Can't write CTR while initializing i8042\n");
		return -EIO;
	}

/*
 * Flush whatever accumulated while we were disabling keyboard port.
 */

	i8042_flush();

	return 0;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
155
73.46%
4
36.36%
Vojtech Pavlik
37
17.54%
5
45.45%
Linus Torvalds
11
5.21%
1
9.09%
Joe Perches
8
3.79%
1
9.09%
Total
211
100.00%
11
100.00%

/*
 * Reset the controller and reset CRT to the original value set by BIOS.
 */



static void i8042_controller_reset(bool s2r_wants_reset)
{
	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);

	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
		pr_warn("Can't write CTR while resetting\n");

/*
 * Disable MUX mode if present.
 */

	if (i8042_mux_present)
		i8042_set_mux_mode(false, NULL);

/*
 * Reset the controller if requested.
 */

	if (i8042_reset == I8042_RESET_ALWAYS ||
	    (i8042_reset == I8042_RESET_ON_S2RAM && s2r_wants_reset)) {
		i8042_controller_selftest();
	}

/*
 * Restore the original control register setting.
 */

	if (i8042_command(&i8042_initial_ctr, I8042_CMD_CTL_WCTR))
		pr_warn("Can't restore CTR\n");
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
42
46.15%
7
50.00%
Andrew Morton
20
21.98%
1
7.14%
Vojtech Pavlik
12
13.19%
3
21.43%
Marcos Paulo de Souza
12
13.19%
1
7.14%
Joe Perches
4
4.40%
1
7.14%
Adrian Bunk
1
1.10%
1
7.14%
Total
91
100.00%
14
100.00%

/*
 * i8042_panic_blink() will turn the keyboard LEDs on or off and is called
 * when kernel panics. Flashing LEDs is useful for users running X who may
 * not see the console and will help distinguishing panics from "real"
 * lockups.
 *
 * Note that DELAY has a limit of 10ms so we will not get stuck here
 * waiting for KBC to free up even if KBD interrupt is off
 */


#define DELAY do { mdelay(1); if (++delay > 10) return delay; } while(0)



static long i8042_panic_blink(int state)
{
	long delay = 0;
	char led;

	led = (state) ? 0x01 | 0x04 : 0;
	while (i8042_read_status() & I8042_STR_IBF)
		DELAY;
	dbg("%02x -> i8042 (panic blink)\n", 0xed);
	i8042_suppress_kbd_ack = 2;
	i8042_write_data(0xed); /* set leds */
	DELAY;
	while (i8042_read_status() & I8042_STR_IBF)
		DELAY;
	DELAY;
	dbg("%02x -> i8042 (panic blink)\n", led);
	i8042_write_data(led);
	DELAY;
	return delay;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
58
68.24%
1
20.00%
Dmitry Torokhov
16
18.82%
2
40.00%
Tamuki Shoichi
9
10.59%
1
20.00%
Joe Perches
2
2.35%
1
20.00%
Total
85
100.00%
5
100.00%


#undef DELAY

#ifdef CONFIG_X86


static void i8042_dritek_enable(void)
{
	unsigned char param = 0x90;
	int error;

	error = i8042_command(&param, 0x1059);
	if (error)
		pr_warn("Failed to enable DRITEK extension: %d\n", error);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Bruno Prémont
36
94.74%
1
33.33%
Christoph Fritz
1
2.63%
1
33.33%
Joe Perches
1
2.63%
1
33.33%
Total
38
100.00%
3
100.00%

#endif

#ifdef CONFIG_PM

/*
 * Here we try to reset everything back to a state we had
 * before suspending.
 */



static int i8042_controller_resume(bool s2r_wants_reset)
{
	int error;

	error = i8042_controller_check();
	if (error)
		return error;

	if (i8042_reset == I8042_RESET_ALWAYS ||
	    (i8042_reset == I8042_RESET_ON_S2RAM && s2r_wants_reset)) {
		error = i8042_controller_selftest();
		if (error)
			return error;
	}

/*
 * Restore original CTR value and disable all ports
 */

	i8042_ctr = i8042_initial_ctr;
	if (i8042_direct)
		i8042_ctr &= ~I8042_CTR_XLATE;
	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)) {
		pr_warn("Can't write CTR to resume, retrying...\n");
		msleep(50);
		if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
			pr_err("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(true, NULL) || i8042_enable_mux_ports())
			pr_warn("failed to resume active multiplexor, mouse won't work\n");
	} else if (i8042_ports[I8042_AUX_PORT_NO].serio)
		i8042_enable_aux_port();

	if (i8042_ports[I8042_KBD_PORT_NO].serio)
		i8042_enable_kbd_port();

	i8042_interrupt(0, NULL);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
116
59.79%
7
38.89%
Vojtech Pavlik
28
14.43%
5
27.78%
Jiri Kosina
20
10.31%
1
5.56%
Bruno Prémont
12
6.19%
1
5.56%
Marcos Paulo de Souza
10
5.15%
1
5.56%
Joe Perches
6
3.09%
1
5.56%
Andrew Morton
1
0.52%
1
5.56%
Andi Kleen
1
0.52%
1
5.56%
Total
194
100.00%
18
100.00%

/*
 * Here we try to restore the original BIOS settings to avoid
 * upsetting it.
 */



static int i8042_pm_suspend(struct device *dev)
{
	int i;

	if (pm_suspend_via_firmware())
		i8042_controller_reset(true);

	/* Set up serio interrupts for system wakeup. */
	for (i = 0; i < I8042_NUM_PORTS; i++) {
		struct serio *serio = i8042_ports[i].serio;

		if (serio && device_may_wakeup(&serio->dev))
			enable_irq_wake(i8042_ports[i].irq);
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
58
75.32%
2
50.00%
Dmitry Torokhov
19
24.68%
2
50.00%
Total
77
100.00%
4
100.00%



static int i8042_pm_resume_noirq(struct device *dev)
{
	if (!pm_resume_via_firmware())
		i8042_interrupt(0, NULL);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
27
100.00%
1
100.00%
Total
27
100.00%
1
100.00%



static int i8042_pm_resume(struct device *dev)
{
	bool want_reset;
	int i;

	for (i = 0; i < I8042_NUM_PORTS; i++) {
		struct serio *serio = i8042_ports[i].serio;

		if (serio && device_may_wakeup(&serio->dev))
			disable_irq_wake(i8042_ports[i].irq);
	}

	/*
         * If platform firmware was not going to be involved in suspend, we did
         * not restore the controller state to whatever it had been at boot
         * time, so we do not need to do anything.
         */
	if (!pm_suspend_via_firmware())
		return 0;

	/*
         * We only need to reset the controller if we are resuming after handing
         * off control to the platform firmware, otherwise we can simply restore
         * the mode.
         */
	want_reset = pm_resume_via_firmware();

	return i8042_controller_resume(want_reset);
}

Contributors
Person
Tokens
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CommitProp
Rafael J. Wysocki
69
78.41%
2
50.00%
Dmitry Torokhov
16
18.18%
1
25.00%
Marcos Paulo de Souza
3
3.41%
1
25.00%
Total
88
100.00%
4
100.00%



static int i8042_pm_thaw(struct device *dev)
{
	i8042_interrupt(0, NULL);

	return 0;
}

Contributors
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Alan Jenkins
21
100.00%
1
100.00%
Total
21
100.00%
1
100.00%



static int i8042_pm_reset(struct device *dev)
{
	i8042_controller_reset(false);

	return 0;
}

Contributors
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Dmitry Torokhov
19
100.00%
1
100.00%
Total
19
100.00%
1
100.00%



static int i8042_pm_restore(struct device *dev)
{
	return i8042_controller_resume(false);
}

Contributors
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Dmitry Torokhov
17
100.00%
1
100.00%
Total
17
100.00%
1
100.00%


static const struct dev_pm_ops i8042_pm_ops = {
	.suspend	= i8042_pm_suspend,
	.resume_noirq	= i8042_pm_resume_noirq,
	.resume		= i8042_pm_resume,
	.thaw		= i8042_pm_thaw,
	.poweroff	= i8042_pm_reset,
	.restore	= i8042_pm_restore,
};

#endif /* CONFIG_PM */

/*
 * We need to reset the 8042 back to original mode on system shutdown,
 * because otherwise BIOSes will be confused.
 */



static void i8042_shutdown(struct platform_device *dev)
{
	i8042_controller_reset(false);
}

Contributors
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Tokens
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CommitProp
Dmitry Torokhov
15
93.75%
3
75.00%
Russell King
1
6.25%
1
25.00%
Total
16
100.00%
4
100.00%



static int __init i8042_create_kbd_port(void)
{
	struct serio *serio;
	struct i8042_port *port = &i8042_ports[I8042_KBD_PORT_NO];

	serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
	if (!serio)
		return -ENOMEM;

	serio->id.type		= i8042_direct ? SERIO_8042 : SERIO_8042_XL;
	serio->write		= i8042_dumbkbd ? NULL : i8042_kbd_write;
	serio->start		= i8042_start;
	serio->stop		= i8042_stop;
	serio->close		= i8042_port_close;
	serio->ps2_cmd_mutex	= &i8042_mutex;
	serio->port_data	= port;
	serio->dev.parent	= &i8042_platform_device->dev;
	strlcpy(serio->name, "i8042 KBD port", sizeof(serio->name));
	strlcpy(serio->phys, I8042_KBD_PHYS_DESC, sizeof(serio->phys));
	strlcpy(serio->firmware_id, i8042_kbd_firmware_id,
		sizeof(serio->firmware_id));

	port->serio = serio;
	port->irq = I8042_KBD_IRQ;

	return 0;
}

Contributors
Person
Tokens
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CommitProp
Dmitry Torokhov
158
90.80%
10
90.91%
Hans de Goede
16
9.20%
1
9.09%
Total
174
100.00%
11
100.00%



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;
	struct i8042_port *port = &i8042_ports[port_no];

	serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
	if (!serio)
		return -ENOMEM;

	serio->id.type		= SERIO_8042;
	serio->write		= i8042_aux_write;
	serio->start		= i8042_start;
	serio->stop		= i8042_stop;
	serio->ps2_cmd_mutex	= &i8042_mutex;
	serio->port_data	= port;
	serio->dev.parent	= &i8042_platform_device->dev;
	if (idx < 0) {
		strlcpy(serio->name, "i8042 AUX port", sizeof(serio->name));
		strlcpy(serio->phys, I8042_AUX_PHYS_DESC, sizeof(serio->phys));
		strlcpy(serio->firmware_id, i8042_aux_firmware_id,
			sizeof(serio->firmware_id));
		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);
		strlcpy(serio->firmware_id, i8042_aux_firmware_id,
			sizeof(serio->firmware_id));
	}

	port->serio = serio;
	port->mux = idx;
	port->irq = I8042_AUX_IRQ;

	return 0;
}

Contributors
Person
Tokens
Prop
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CommitProp
Dmitry Torokhov
213
84.86%
11
73.33%
Hans de Goede
32
12.75%
2
13.33%
Vojtech Pavlik
6
2.39%
2
13.33%
Total
251
100.00%
15
100.00%



static void __init i8042_free_kbd_port(void)
{
	kfree(i8042_ports[I8042_KBD_PORT_NO].serio);
	i8042_ports[I8042_KBD_PORT_NO].serio = NULL;
}

Contributors
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Tokens
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CommitProp
Dmitry Torokhov
28
100.00%
2
100.00%
Total
28
100.00%
2
100.00%



static void __init i8042_free_aux_ports(void)
{
	int i;

	for (i = I8042_AUX_PORT_NO; i < I8042_NUM_PORTS; i++) {
		kfree(i8042_ports[i].serio);
		i8042_ports[i].serio = NULL;
	}
}

Contributors
Person
Tokens
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CommitProp
Dmitry Torokhov
46
100.00%
2
100.00%
Total
46
100.00%
2
100.00%



static void __init i8042_register_ports(void)
{
	int i;

	for (i = 0; i < I8042_NUM_PORTS; i++) {
		struct serio *serio = i8042_ports[i].serio;

		if (serio) {
			printk(KERN_INFO "serio: %s at %#lx,%#lx irq %d\n",
				serio->name,
				(unsigned long) I8042_DATA_REG,
				(unsigned long) I8042_COMMAND_REG,
				i8042_ports[i].irq);
			serio_register_port(serio);
			device_set_wakeup_capable(&serio->dev, true);
		}
	}
}

Contributors
Person
Tokens
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Commits
CommitProp
Dmitry Torokhov
70
78.65%
2
66.67%
Rafael J. Wysocki
19
21.35%
1
33.33%
Total
89
100.00%
3
100.00%



static void i8042_unregister_ports(void)
{
	int i;

	for (i = 0; i < I8042_NUM_PORTS; i++) {
		if (i8042_ports[i].serio) {
			serio_unregister_port(i8042_ports[i].serio);
			i8042_ports[i].serio = NULL;
		}
	}
}

Contributors
Person
Tokens
Prop
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CommitProp
Dmitry Torokhov
56
100.00%
1
100.00%
Total
56
100.00%
1
100.00%



static void i8042_free_irqs(void)
{
	if (i8042_aux_irq_registered)
		free_irq(I8042_AUX_IRQ, i8042_platform_device);
	if (i8042_kbd_irq_registered)
		free_irq(I8042_KBD_IRQ, i8042_platform_device);

	i8042_aux_irq_registered = i8042_kbd_irq_registered = false;
}

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Dmitry Torokhov
36
100.00%
2
100.00%
Total
36
100.00%
2
100.00%



static int __init i8042_setup_aux(void)
{
	int (*aux_enable)(void);
	int error;
	int i;

	if (i8042_check_aux())
		return -ENODEV;

	if (i8042_nomux || i8042_check_mux()) {
		error = i8042_create_aux_port(-1);
		if (error)
			goto err_free_ports;
		aux_enable = i8042_enable_aux_port;
	} else {
		for (i = 0; i < I8042_NUM_MUX_PORTS; i++) {
			error = i8042_create_aux_port(i);
			if (error)
				goto err_free_ports;
		}
		aux_enable = i8042_enable_mux_ports;
	}

	error = request_irq(I8042_AUX_IRQ, i8042_interrupt, IRQF_SHARED,
			    "i8042", i8042_platform_device);
	if (error)
		goto err_free_ports;

	if (aux_enable())
		goto err_free_irq;

	i8042_aux_irq_registered = true;
	return 0;

 err_free_irq:
	free_irq(I8042_AUX_IRQ, i8042_platform_device);
 err_free_ports:
	i8042_free_aux_ports();
	return error;
}

Contributors
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CommitProp
Dmitry Torokhov
151
100.00%
3
100.00%
Total
151
100.00%
3
100.00%



static int __init i8042_setup_kbd(void)
{
	int error;

	error = i8042_create_kbd_port();
	if (error)
		return error;

	error = request_irq(I8042_KBD_IRQ, i8042_interrupt, IRQF_SHARED,
			    "i8042", i8042_platform_device);
	if (error)
		goto err_free_port;

	error = i8042_enable_kbd_port();
	if (error)
		goto err_free_irq;

	i8042_kbd_irq_registered = true;
	return 0;

 err_free_irq:
	free_irq(I8042_KBD_IRQ, i8042_platform_device);
 err_free_port:
	i8042_free_kbd_port();
	return error;
}

Contributors
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Dmitry Torokhov
82
100.00%
6
100.00%
Total
82
100.00%
6
100.00%



static int i8042_kbd_bind_notifier(struct notifier_block *nb,
				   unsigned long action, void *data)
{
	struct device *dev = data;
	struct serio *serio = to_serio_port(dev);
	struct i8042_port *port = serio->port_data;

	if (serio != i8042_ports[I8042_KBD_PORT_NO].serio)
		return 0;

	switch (action) {
	case BUS_NOTIFY_BOUND_DRIVER:
		port->driver_bound = true;
		break;

	case BUS_NOTIFY_UNBIND_DRIVER:
		port->driver_bound = false;
		break;
	}

	return 0;
}

Contributors
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Tokens
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CommitProp
Stephen Chandler Paul
88
100.00%
1
100.00%
Total
88
100.00%
1
100.00%



static int __init i8042_probe(struct platform_device *dev)
{
	int error;

	i8042_platform_device = dev;

	if (i8042_reset == I8042_RESET_ALWAYS) {
		error = i8042_controller_selftest();
		if (error)
			return error;
	}

	error = i8042_controller_init();
	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)
			goto out_fail;
	}

	if (!i8042_nokbd) {
		error = i8042_setup_kbd();
		if (error)
			goto out_fail;
	}
/*
 * Ok, everything is ready, let's register all serio ports
 */
	i8042_register_ports();

	return 0;

 out_fail:
	i8042_free_aux_ports();	/* in case KBD failed but AUX not */
	i8042_free_irqs();
	i8042_controller_reset(false);
	i8042_platform_device = NULL;

	return error;
}

Contributors
Person
Tokens
Prop
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CommitProp
Dmitry Torokhov
106
76.26%
11
64.71%
Vojtech Pavlik
18
12.95%
3
17.65%
Bruno Prémont
12
8.63%
1
5.88%
Marcos Paulo de Souza
2
1.44%
1
5.88%
Adrian Bunk
1
0.72%
1
5.88%
Total
139
100.00%
17
100.00%



static int i8042_remove(struct platform_device *dev)
{
	i8042_unregister_ports();
	i8042_free_irqs();
	i8042_controller_reset(false);
	i8042_platform_device = NULL;

	return 0;
}

Contributors
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Tokens
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CommitProp
Dmitry Torokhov
22
75.86%
5
62.50%
Vojtech Pavlik
6
20.69%
2
25.00%
Adrian Bunk
1
3.45%
1
12.50%
Total
29
100.00%
8
100.00%


static struct platform_driver i8042_driver = {
	.driver		= {
		.name	= "i8042",
#ifdef CONFIG_PM
		.pm	= &i8042_pm_ops,
#endif
	},
	.remove		= i8042_remove,
	.shutdown	= i8042_shutdown,
};


static struct notifier_block i8042_kbd_bind_notifier_block = {
	.notifier_call = i8042_kbd_bind_notifier,
};



static int __init i8042_init(void)
{
	struct platform_device *pdev;
	int err;

	dbg_init();

	err = i8042_platform_init();
	if (err)
		return err;

	err = i8042_controller_check();
	if (err)
		goto err_platform_exit;

	pdev = platform_create_bundle(&i8042_driver, i8042_probe, NULL, 0, NULL, 0);
	if (IS_ERR(pdev)) {
		err = PTR_ERR(pdev);
		goto err_platform_exit;
	}

	bus_register_notifier(&serio_bus, &i8042_kbd_bind_notifier_block);
	panic_blink = i8042_panic_blink;

	return 0;

 err_platform_exit:
	i8042_platform_exit();
	return err;
}

Contributors
Person
Tokens
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Commits
CommitProp
Dmitry Torokhov
96
91.43%
4
80.00%
Stephen Chandler Paul
9
8.57%
1
20.00%
Total
105
100.00%
5
100.00%



static void __exit i8042_exit(void)
{
	platform_device_unregister(i8042_platform_device);
	platform_driver_unregister(&i8042_driver);
	i8042_platform_exit();

	bus_unregister_notifier(&serio_bus, &i8042_kbd_bind_notifier_block);
	panic_blink = NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
19
52.78%
4
50.00%
Stephen Chandler Paul
9
25.00%
1
12.50%
Andi Kleen
4
11.11%
1
12.50%
Vojtech Pavlik
4
11.11%
2
25.00%
Total
36
100.00%
8
100.00%


module_init(i8042_init);

module_exit(i8042_exit);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
2961
54.47%
44
39.29%
Vojtech Pavlik
996
18.32%
23
20.54%
Matthew Garrett
225
4.14%
1
0.89%
Rafael J. Wysocki
181
3.33%
2
1.79%
Marcos Paulo de Souza
159
2.92%
3
2.68%
Stephen Chandler Paul
154
2.83%
1
0.89%
Andrew Morton
91
1.67%
4
3.57%
Roland Scheidegger
89
1.64%
1
0.89%
Andi Kleen
70
1.29%
1
0.89%
Bruno Prémont
65
1.20%
1
0.89%
Hans de Goede
62
1.14%
2
1.79%
Joe Perches
57
1.05%
1
0.89%
Srihari Vijayaraghavan
45
0.83%
1
0.89%
Jiri Kosina
45
0.83%
2
1.79%
Arjan van de Ven
40
0.74%
1
0.89%
Alan Jenkins
26
0.48%
1
0.89%
Carlos Corbacho
26
0.48%
1
0.89%
Andrey Moiseev
23
0.42%
1
0.89%
Björn Helgaas
20
0.37%
1
0.89%
Markus Armbruster
18
0.33%
1
0.89%
Fernando Luis Vázquez Cao
13
0.24%
1
0.89%
Linus Torvalds
13
0.24%
2
1.79%
Tamuki Shoichi
9
0.17%
1
0.89%
Márton Németh
8
0.15%
1
0.89%
Paul Bolle
8
0.15%
1
0.89%
Matthieu Castet
6
0.11%
1
0.89%
Thomas Gleixner
4
0.07%
1
0.89%
Adrian Bunk
4
0.07%
1
0.89%
Russell King
4
0.07%
2
1.79%
Matthew Wilcox
4
0.07%
1
0.89%
Tejun Heo
3
0.06%
1
0.89%
Peter Berg Larsen
2
0.04%
1
0.89%
Michael Opdenacker
1
0.02%
1
0.89%
Stefan Weil
1
0.02%
1
0.89%
Dominik Brodowski
1
0.02%
1
0.89%
Takashi Iwai
1
0.02%
1
0.89%
Christoph Fritz
1
0.02%
1
0.89%
Total
5436
100.00%
112
100.00%
Directory: drivers/input/serio

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