1 // SPDX-License-Identifier: GPL-2.0-only
3 * i8042 keyboard and mouse controller driver for Linux
5 * Copyright (c) 1999-2004 Vojtech Pavlik
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11 #include <linux/types.h>
12 #include <linux/delay.h>
13 #include <linux/module.h>
14 #include <linux/interrupt.h>
15 #include <linux/ioport.h>
16 #include <linux/init.h>
17 #include <linux/serio.h>
18 #include <linux/err.h>
19 #include <linux/rcupdate.h>
20 #include <linux/platform_device.h>
21 #include <linux/i8042.h>
22 #include <linux/slab.h>
23 #include <linux/suspend.h>
24 #include <linux/property.h>
28 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
29 MODULE_DESCRIPTION("i8042 keyboard and mouse controller driver");
30 MODULE_LICENSE("GPL");
32 static bool i8042_nokbd;
33 module_param_named(nokbd, i8042_nokbd, bool, 0);
34 MODULE_PARM_DESC(nokbd, "Do not probe or use KBD port.");
36 static bool i8042_noaux;
37 module_param_named(noaux, i8042_noaux, bool, 0);
38 MODULE_PARM_DESC(noaux, "Do not probe or use AUX (mouse) port.");
40 static bool i8042_nomux;
41 module_param_named(nomux, i8042_nomux, bool, 0);
42 MODULE_PARM_DESC(nomux, "Do not check whether an active multiplexing controller is present.");
44 static bool i8042_unlock;
45 module_param_named(unlock, i8042_unlock, bool, 0);
46 MODULE_PARM_DESC(unlock, "Ignore keyboard lock.");
48 enum i8042_controller_reset_mode {
52 #define I8042_RESET_DEFAULT I8042_RESET_ON_S2RAM
54 static enum i8042_controller_reset_mode i8042_reset = I8042_RESET_DEFAULT;
55 static int i8042_set_reset(const char *val, const struct kernel_param *kp)
57 enum i8042_controller_reset_mode *arg = kp->arg;
62 error = kstrtobool(val, &reset);
69 *arg = reset ? I8042_RESET_ALWAYS : I8042_RESET_NEVER;
73 static const struct kernel_param_ops param_ops_reset_param = {
74 .flags = KERNEL_PARAM_OPS_FL_NOARG,
75 .set = i8042_set_reset,
77 #define param_check_reset_param(name, p) \
78 __param_check(name, p, enum i8042_controller_reset_mode)
79 module_param_named(reset, i8042_reset, reset_param, 0);
80 MODULE_PARM_DESC(reset, "Reset controller on resume, cleanup or both");
82 static bool i8042_direct;
83 module_param_named(direct, i8042_direct, bool, 0);
84 MODULE_PARM_DESC(direct, "Put keyboard port into non-translated mode.");
86 static bool i8042_dumbkbd;
87 module_param_named(dumbkbd, i8042_dumbkbd, bool, 0);
88 MODULE_PARM_DESC(dumbkbd, "Pretend that controller can only read data from keyboard");
90 static bool i8042_noloop;
91 module_param_named(noloop, i8042_noloop, bool, 0);
92 MODULE_PARM_DESC(noloop, "Disable the AUX Loopback command while probing for the AUX port");
94 static bool i8042_notimeout;
95 module_param_named(notimeout, i8042_notimeout, bool, 0);
96 MODULE_PARM_DESC(notimeout, "Ignore timeouts signalled by i8042");
98 static bool i8042_kbdreset;
99 module_param_named(kbdreset, i8042_kbdreset, bool, 0);
100 MODULE_PARM_DESC(kbdreset, "Reset device connected to KBD port");
103 static bool i8042_dritek;
104 module_param_named(dritek, i8042_dritek, bool, 0);
105 MODULE_PARM_DESC(dritek, "Force enable the Dritek keyboard extension");
109 static bool i8042_nopnp;
110 module_param_named(nopnp, i8042_nopnp, bool, 0);
111 MODULE_PARM_DESC(nopnp, "Do not use PNP to detect controller settings");
116 static bool i8042_debug;
117 module_param_named(debug, i8042_debug, bool, 0600);
118 MODULE_PARM_DESC(debug, "Turn i8042 debugging mode on and off");
120 static bool i8042_unmask_kbd_data;
121 module_param_named(unmask_kbd_data, i8042_unmask_kbd_data, bool, 0600);
122 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]");
125 static bool i8042_bypass_aux_irq_test;
126 static char i8042_kbd_firmware_id[128];
127 static char i8042_aux_firmware_id[128];
128 static struct fwnode_handle *i8042_kbd_fwnode;
133 * i8042_lock protects serialization between i8042_command and
134 * the interrupt handler.
136 static DEFINE_SPINLOCK(i8042_lock);
139 * Writers to AUX and KBD ports as well as users issuing i8042_command
140 * directly should acquire i8042_mutex (by means of calling
141 * i8042_lock_chip() and i8042_unlock_ship() helpers) to ensure that
142 * they do not disturb each other (unfortunately in many i8042
143 * implementations write to one of the ports will immediately abort
144 * command that is being processed by another port).
146 static DEFINE_MUTEX(i8042_mutex);
156 #define I8042_KBD_PORT_NO 0
157 #define I8042_AUX_PORT_NO 1
158 #define I8042_MUX_PORT_NO 2
159 #define I8042_NUM_PORTS (I8042_NUM_MUX_PORTS + 2)
161 static struct i8042_port i8042_ports[I8042_NUM_PORTS];
163 static unsigned char i8042_initial_ctr;
164 static unsigned char i8042_ctr;
165 static bool i8042_mux_present;
166 static bool i8042_kbd_irq_registered;
167 static bool i8042_aux_irq_registered;
168 static unsigned char i8042_suppress_kbd_ack;
169 static struct platform_device *i8042_platform_device;
170 static struct notifier_block i8042_kbd_bind_notifier_block;
172 static irqreturn_t i8042_interrupt(int irq, void *dev_id);
173 static bool (*i8042_platform_filter)(unsigned char data, unsigned char str,
174 struct serio *serio);
176 void i8042_lock_chip(void)
178 mutex_lock(&i8042_mutex);
180 EXPORT_SYMBOL(i8042_lock_chip);
182 void i8042_unlock_chip(void)
184 mutex_unlock(&i8042_mutex);
186 EXPORT_SYMBOL(i8042_unlock_chip);
188 int i8042_install_filter(bool (*filter)(unsigned char data, unsigned char str,
189 struct serio *serio))
194 spin_lock_irqsave(&i8042_lock, flags);
196 if (i8042_platform_filter) {
201 i8042_platform_filter = filter;
204 spin_unlock_irqrestore(&i8042_lock, flags);
207 EXPORT_SYMBOL(i8042_install_filter);
209 int i8042_remove_filter(bool (*filter)(unsigned char data, unsigned char str,
215 spin_lock_irqsave(&i8042_lock, flags);
217 if (i8042_platform_filter != filter) {
222 i8042_platform_filter = NULL;
225 spin_unlock_irqrestore(&i8042_lock, flags);
228 EXPORT_SYMBOL(i8042_remove_filter);
231 * The i8042_wait_read() and i8042_wait_write functions wait for the i8042 to
232 * be ready for reading values from it / writing values to it.
233 * Called always with i8042_lock held.
236 static int i8042_wait_read(void)
240 while ((~i8042_read_status() & I8042_STR_OBF) && (i < I8042_CTL_TIMEOUT)) {
244 return -(i == I8042_CTL_TIMEOUT);
247 static int i8042_wait_write(void)
251 while ((i8042_read_status() & I8042_STR_IBF) && (i < I8042_CTL_TIMEOUT)) {
255 return -(i == I8042_CTL_TIMEOUT);
259 * i8042_flush() flushes all data that may be in the keyboard and mouse buffers
260 * of the i8042 down the toilet.
263 static int i8042_flush(void)
266 unsigned char data, str;
270 spin_lock_irqsave(&i8042_lock, flags);
272 while ((str = i8042_read_status()) & I8042_STR_OBF) {
273 if (count++ < I8042_BUFFER_SIZE) {
275 data = i8042_read_data();
276 dbg("%02x <- i8042 (flush, %s)\n",
277 data, str & I8042_STR_AUXDATA ? "aux" : "kbd");
284 spin_unlock_irqrestore(&i8042_lock, flags);
290 * i8042_command() executes a command on the i8042. It also sends the input
291 * parameter(s) of the commands to it, and receives the output value(s). The
292 * parameters are to be stored in the param array, and the output is placed
293 * into the same array. The number of the parameters and output values is
294 * encoded in bits 8-11 of the command number.
297 static int __i8042_command(unsigned char *param, int command)
301 if (i8042_noloop && command == I8042_CMD_AUX_LOOP)
304 error = i8042_wait_write();
308 dbg("%02x -> i8042 (command)\n", command & 0xff);
309 i8042_write_command(command & 0xff);
311 for (i = 0; i < ((command >> 12) & 0xf); i++) {
312 error = i8042_wait_write();
314 dbg(" -- i8042 (wait write timeout)\n");
317 dbg("%02x -> i8042 (parameter)\n", param[i]);
318 i8042_write_data(param[i]);
321 for (i = 0; i < ((command >> 8) & 0xf); i++) {
322 error = i8042_wait_read();
324 dbg(" -- i8042 (wait read timeout)\n");
328 if (command == I8042_CMD_AUX_LOOP &&
329 !(i8042_read_status() & I8042_STR_AUXDATA)) {
330 dbg(" -- i8042 (auxerr)\n");
334 param[i] = i8042_read_data();
335 dbg("%02x <- i8042 (return)\n", param[i]);
341 int i8042_command(unsigned char *param, int command)
346 spin_lock_irqsave(&i8042_lock, flags);
347 retval = __i8042_command(param, command);
348 spin_unlock_irqrestore(&i8042_lock, flags);
352 EXPORT_SYMBOL(i8042_command);
355 * i8042_kbd_write() sends a byte out through the keyboard interface.
358 static int i8042_kbd_write(struct serio *port, unsigned char c)
363 spin_lock_irqsave(&i8042_lock, flags);
365 if (!(retval = i8042_wait_write())) {
366 dbg("%02x -> i8042 (kbd-data)\n", c);
370 spin_unlock_irqrestore(&i8042_lock, flags);
376 * i8042_aux_write() sends a byte out through the aux interface.
379 static int i8042_aux_write(struct serio *serio, unsigned char c)
381 struct i8042_port *port = serio->port_data;
383 return i8042_command(&c, port->mux == -1 ?
385 I8042_CMD_MUX_SEND + port->mux);
390 * i8042_port_close attempts to clear AUX or KBD port state by disabling
391 * and then re-enabling it.
394 static void i8042_port_close(struct serio *serio)
398 const char *port_name;
400 if (serio == i8042_ports[I8042_AUX_PORT_NO].serio) {
401 irq_bit = I8042_CTR_AUXINT;
402 disable_bit = I8042_CTR_AUXDIS;
405 irq_bit = I8042_CTR_KBDINT;
406 disable_bit = I8042_CTR_KBDDIS;
410 i8042_ctr &= ~irq_bit;
411 if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
412 pr_warn("Can't write CTR while closing %s port\n", port_name);
416 i8042_ctr &= ~disable_bit;
417 i8042_ctr |= irq_bit;
418 if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
419 pr_err("Can't reactivate %s port\n", port_name);
422 * See if there is any data appeared while we were messing with
425 i8042_interrupt(0, NULL);
429 * i8042_start() is called by serio core when port is about to finish
430 * registering. It will mark port as existing so i8042_interrupt can
431 * start sending data through it.
433 static int i8042_start(struct serio *serio)
435 struct i8042_port *port = serio->port_data;
437 device_set_wakeup_capable(&serio->dev, true);
440 * On platforms using suspend-to-idle, allow the keyboard to
441 * wake up the system from sleep by enabling keyboard wakeups
442 * by default. This is consistent with keyboard wakeup
443 * behavior on many platforms using suspend-to-RAM (ACPI S3)
446 if (pm_suspend_default_s2idle() &&
447 serio == i8042_ports[I8042_KBD_PORT_NO].serio) {
448 device_set_wakeup_enable(&serio->dev, true);
451 spin_lock_irq(&i8042_lock);
453 spin_unlock_irq(&i8042_lock);
459 * i8042_stop() marks serio port as non-existing so i8042_interrupt
460 * will not try to send data to the port that is about to go away.
461 * The function is called by serio core as part of unregister procedure.
463 static void i8042_stop(struct serio *serio)
465 struct i8042_port *port = serio->port_data;
467 spin_lock_irq(&i8042_lock);
468 port->exists = false;
470 spin_unlock_irq(&i8042_lock);
473 * We need to make sure that interrupt handler finishes using
474 * our serio port before we return from this function.
475 * We synchronize with both AUX and KBD IRQs because there is
476 * a (very unlikely) chance that AUX IRQ is raised for KBD port
479 synchronize_irq(I8042_AUX_IRQ);
480 synchronize_irq(I8042_KBD_IRQ);
484 * i8042_filter() filters out unwanted bytes from the input data stream.
485 * It is called from i8042_interrupt and thus is running with interrupts
486 * off and i8042_lock held.
488 static bool i8042_filter(unsigned char data, unsigned char str,
491 if (unlikely(i8042_suppress_kbd_ack)) {
492 if ((~str & I8042_STR_AUXDATA) &&
493 (data == 0xfa || data == 0xfe)) {
494 i8042_suppress_kbd_ack--;
495 dbg("Extra keyboard ACK - filtered out\n");
500 if (i8042_platform_filter && i8042_platform_filter(data, str, serio)) {
501 dbg("Filtered out by platform filter\n");
509 * i8042_interrupt() is the most important function in this driver -
510 * it handles the interrupts from the i8042, and sends incoming bytes
511 * to the upper layers.
514 static irqreturn_t i8042_interrupt(int irq, void *dev_id)
516 struct i8042_port *port;
519 unsigned char str, data;
521 unsigned int port_no;
525 spin_lock_irqsave(&i8042_lock, flags);
527 str = i8042_read_status();
528 if (unlikely(~str & I8042_STR_OBF)) {
529 spin_unlock_irqrestore(&i8042_lock, flags);
531 dbg("Interrupt %d, without any data\n", irq);
536 data = i8042_read_data();
538 if (i8042_mux_present && (str & I8042_STR_AUXDATA)) {
539 static unsigned long last_transmit;
540 static unsigned char last_str;
543 if (str & I8042_STR_MUXERR) {
544 dbg("MUX error, status is %02x, data is %02x\n",
547 * When MUXERR condition is signalled the data register can only contain
548 * 0xfd, 0xfe or 0xff if implementation follows the spec. Unfortunately
549 * it is not always the case. Some KBCs also report 0xfc when there is
550 * nothing connected to the port while others sometimes get confused which
551 * port the data came from and signal error leaving the data intact. They
552 * _do not_ revert to legacy mode (actually I've never seen KBC reverting
553 * to legacy mode yet, when we see one we'll add proper handling).
554 * Anyway, we process 0xfc, 0xfd, 0xfe and 0xff as timeouts, and for the
555 * rest assume that the data came from the same serio last byte
556 * was transmitted (if transmission happened not too long ago).
561 if (time_before(jiffies, last_transmit + HZ/10)) {
565 fallthrough; /* report timeout */
568 case 0xfe: dfl = SERIO_TIMEOUT; data = 0xfe; break;
569 case 0xff: dfl = SERIO_PARITY; data = 0xfe; break;
573 port_no = I8042_MUX_PORT_NO + ((str >> 6) & 3);
575 last_transmit = jiffies;
578 dfl = ((str & I8042_STR_PARITY) ? SERIO_PARITY : 0) |
579 ((str & I8042_STR_TIMEOUT && !i8042_notimeout) ? SERIO_TIMEOUT : 0);
581 port_no = (str & I8042_STR_AUXDATA) ?
582 I8042_AUX_PORT_NO : I8042_KBD_PORT_NO;
585 port = &i8042_ports[port_no];
586 serio = port->exists ? port->serio : NULL;
588 filter_dbg(port->driver_bound, data, "<- i8042 (interrupt, %d, %d%s%s)\n",
590 dfl & SERIO_PARITY ? ", bad parity" : "",
591 dfl & SERIO_TIMEOUT ? ", timeout" : "");
593 filtered = i8042_filter(data, str, serio);
595 spin_unlock_irqrestore(&i8042_lock, flags);
597 if (likely(serio && !filtered))
598 serio_interrupt(serio, data, dfl);
601 return IRQ_RETVAL(ret);
605 * i8042_enable_kbd_port enables keyboard port on chip
608 static int i8042_enable_kbd_port(void)
610 i8042_ctr &= ~I8042_CTR_KBDDIS;
611 i8042_ctr |= I8042_CTR_KBDINT;
613 if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
614 i8042_ctr &= ~I8042_CTR_KBDINT;
615 i8042_ctr |= I8042_CTR_KBDDIS;
616 pr_err("Failed to enable KBD port\n");
624 * i8042_enable_aux_port enables AUX (mouse) port on chip
627 static int i8042_enable_aux_port(void)
629 i8042_ctr &= ~I8042_CTR_AUXDIS;
630 i8042_ctr |= I8042_CTR_AUXINT;
632 if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
633 i8042_ctr &= ~I8042_CTR_AUXINT;
634 i8042_ctr |= I8042_CTR_AUXDIS;
635 pr_err("Failed to enable AUX port\n");
643 * i8042_enable_mux_ports enables 4 individual AUX ports after
644 * the controller has been switched into Multiplexed mode
647 static int i8042_enable_mux_ports(void)
652 for (i = 0; i < I8042_NUM_MUX_PORTS; i++) {
653 i8042_command(¶m, I8042_CMD_MUX_PFX + i);
654 i8042_command(¶m, I8042_CMD_AUX_ENABLE);
657 return i8042_enable_aux_port();
661 * i8042_set_mux_mode checks whether the controller has an
662 * active multiplexor and puts the chip into Multiplexed (true)
663 * or Legacy (false) mode.
666 static int i8042_set_mux_mode(bool multiplex, unsigned char *mux_version)
669 unsigned char param, val;
671 * Get rid of bytes in the queue.
677 * Internal loopback test - send three bytes, they should come back from the
678 * mouse interface, the last should be version.
682 if (i8042_command(¶m, I8042_CMD_AUX_LOOP) || param != val)
684 param = val = multiplex ? 0x56 : 0xf6;
685 if (i8042_command(¶m, I8042_CMD_AUX_LOOP) || param != val)
687 param = val = multiplex ? 0xa4 : 0xa5;
688 if (i8042_command(¶m, I8042_CMD_AUX_LOOP) || param == val)
692 * Workaround for interference with USB Legacy emulation
693 * that causes a v10.12 MUX to be found.
699 *mux_version = param;
705 * i8042_check_mux() checks whether the controller supports the PS/2 Active
706 * Multiplexing specification by Synaptics, Phoenix, Insyde and
710 static int __init i8042_check_mux(void)
712 unsigned char mux_version;
714 if (i8042_set_mux_mode(true, &mux_version))
717 pr_info("Detected active multiplexing controller, rev %d.%d\n",
718 (mux_version >> 4) & 0xf, mux_version & 0xf);
721 * Disable all muxed ports by disabling AUX.
723 i8042_ctr |= I8042_CTR_AUXDIS;
724 i8042_ctr &= ~I8042_CTR_AUXINT;
726 if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
727 pr_err("Failed to disable AUX port, can't use MUX\n");
731 i8042_mux_present = true;
737 * The following is used to test AUX IRQ delivery.
739 static struct completion i8042_aux_irq_delivered __initdata;
740 static bool i8042_irq_being_tested __initdata;
742 static irqreturn_t __init i8042_aux_test_irq(int irq, void *dev_id)
745 unsigned char str, data;
748 spin_lock_irqsave(&i8042_lock, flags);
749 str = i8042_read_status();
750 if (str & I8042_STR_OBF) {
751 data = i8042_read_data();
752 dbg("%02x <- i8042 (aux_test_irq, %s)\n",
753 data, str & I8042_STR_AUXDATA ? "aux" : "kbd");
754 if (i8042_irq_being_tested &&
755 data == 0xa5 && (str & I8042_STR_AUXDATA))
756 complete(&i8042_aux_irq_delivered);
759 spin_unlock_irqrestore(&i8042_lock, flags);
761 return IRQ_RETVAL(ret);
765 * i8042_toggle_aux - enables or disables AUX port on i8042 via command and
766 * verifies success by readinng CTR. Used when testing for presence of AUX
769 static int __init i8042_toggle_aux(bool on)
774 if (i8042_command(¶m,
775 on ? I8042_CMD_AUX_ENABLE : I8042_CMD_AUX_DISABLE))
778 /* some chips need some time to set the I8042_CTR_AUXDIS bit */
779 for (i = 0; i < 100; i++) {
782 if (i8042_command(¶m, I8042_CMD_CTL_RCTR))
785 if (!(param & I8042_CTR_AUXDIS) == on)
793 * i8042_check_aux() applies as much paranoia as it can at detecting
794 * the presence of an AUX interface.
797 static int __init i8042_check_aux(void)
800 bool irq_registered = false;
801 bool aux_loop_broken = false;
806 * Get rid of bytes in the queue.
812 * Internal loopback test - filters out AT-type i8042's. Unfortunately
813 * SiS screwed up and their 5597 doesn't support the LOOP command even
814 * though it has an AUX port.
818 retval = i8042_command(¶m, I8042_CMD_AUX_LOOP);
819 if (retval || param != 0x5a) {
822 * External connection test - filters out AT-soldered PS/2 i8042's
823 * 0x00 - no error, 0x01-0x03 - clock/data stuck, 0xff - general error
824 * 0xfa - no error on some notebooks which ignore the spec
825 * Because it's common for chipsets to return error on perfectly functioning
826 * AUX ports, we test for this only when the LOOP command failed.
829 if (i8042_command(¶m, I8042_CMD_AUX_TEST) ||
830 (param && param != 0xfa && param != 0xff))
834 * If AUX_LOOP completed without error but returned unexpected data
838 aux_loop_broken = true;
842 * Bit assignment test - filters out PS/2 i8042's in AT mode
845 if (i8042_toggle_aux(false)) {
846 pr_warn("Failed to disable AUX port, but continuing anyway... Is this a SiS?\n");
847 pr_warn("If AUX port is really absent please use the 'i8042.noaux' option\n");
850 if (i8042_toggle_aux(true))
854 * Reset keyboard (needed on some laptops to successfully detect
855 * touchpad, e.g., some Gigabyte laptop models with Elantech
858 if (i8042_kbdreset) {
859 pr_warn("Attempting to reset device connected to KBD port\n");
860 i8042_kbd_write(NULL, (unsigned char) 0xff);
864 * Test AUX IRQ delivery to make sure BIOS did not grab the IRQ and
865 * used it for a PCI card or somethig else.
868 if (i8042_noloop || i8042_bypass_aux_irq_test || aux_loop_broken) {
870 * Without LOOP command we can't test AUX IRQ delivery. Assume the port
871 * is working and hope we are right.
877 if (request_irq(I8042_AUX_IRQ, i8042_aux_test_irq, IRQF_SHARED,
878 "i8042", i8042_platform_device))
881 irq_registered = true;
883 if (i8042_enable_aux_port())
886 spin_lock_irqsave(&i8042_lock, flags);
888 init_completion(&i8042_aux_irq_delivered);
889 i8042_irq_being_tested = true;
892 retval = __i8042_command(¶m, I8042_CMD_AUX_LOOP & 0xf0ff);
894 spin_unlock_irqrestore(&i8042_lock, flags);
899 if (wait_for_completion_timeout(&i8042_aux_irq_delivered,
900 msecs_to_jiffies(250)) == 0) {
902 * AUX IRQ was never delivered so we need to flush the controller to
903 * get rid of the byte we put there; otherwise keyboard may not work.
905 dbg(" -- i8042 (aux irq test timeout)\n");
913 * Disable the interface.
916 i8042_ctr |= I8042_CTR_AUXDIS;
917 i8042_ctr &= ~I8042_CTR_AUXINT;
919 if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
923 free_irq(I8042_AUX_IRQ, i8042_platform_device);
928 static int i8042_controller_check(void)
931 pr_info("No controller found\n");
938 static int i8042_controller_selftest(void)
944 * We try this 5 times; on some really fragile systems this does not
945 * take the first time...
949 if (i8042_command(¶m, I8042_CMD_CTL_TEST)) {
950 pr_err("i8042 controller selftest timeout\n");
954 if (param == I8042_RET_CTL_TEST)
957 dbg("i8042 controller selftest: %#x != %#x\n",
958 param, I8042_RET_CTL_TEST);
964 * On x86, we don't fail entire i8042 initialization if controller
965 * reset fails in hopes that keyboard port will still be functional
966 * and user will still get a working keyboard. This is especially
967 * important on netbooks. On other arches we trust hardware more.
969 pr_info("giving up on controller selftest, continuing anyway...\n");
972 pr_err("i8042 controller selftest failed\n");
978 * i8042_controller init initializes the i8042 controller, and,
979 * most importantly, sets it into non-xlated mode if that's
983 static int i8042_controller_init(void)
987 unsigned char ctr[2];
990 * Save the CTR for restore on unload / reboot.
995 pr_err("Unable to get stable CTR read\n");
1002 if (i8042_command(&ctr[n++ % 2], I8042_CMD_CTL_RCTR)) {
1003 pr_err("Can't read CTR while initializing i8042\n");
1007 } while (n < 2 || ctr[0] != ctr[1]);
1009 i8042_initial_ctr = i8042_ctr = ctr[0];
1012 * Disable the keyboard interface and interrupt.
1015 i8042_ctr |= I8042_CTR_KBDDIS;
1016 i8042_ctr &= ~I8042_CTR_KBDINT;
1022 spin_lock_irqsave(&i8042_lock, flags);
1023 if (~i8042_read_status() & I8042_STR_KEYLOCK) {
1025 i8042_ctr |= I8042_CTR_IGNKEYLOCK;
1027 pr_warn("Warning: Keylock active\n");
1029 spin_unlock_irqrestore(&i8042_lock, flags);
1032 * If the chip is configured into nontranslated mode by the BIOS, don't
1033 * bother enabling translating and be happy.
1036 if (~i8042_ctr & I8042_CTR_XLATE)
1037 i8042_direct = true;
1040 * Set nontranslated mode for the kbd interface if requested by an option.
1041 * After this the kbd interface becomes a simple serial in/out, like the aux
1042 * interface is. We don't do this by default, since it can confuse notebook
1047 i8042_ctr &= ~I8042_CTR_XLATE;
1053 if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
1054 pr_err("Can't write CTR while initializing i8042\n");
1059 * Flush whatever accumulated while we were disabling keyboard port.
1069 * Reset the controller and reset CRT to the original value set by BIOS.
1072 static void i8042_controller_reset(bool s2r_wants_reset)
1077 * Disable both KBD and AUX interfaces so they don't get in the way
1080 i8042_ctr |= I8042_CTR_KBDDIS | I8042_CTR_AUXDIS;
1081 i8042_ctr &= ~(I8042_CTR_KBDINT | I8042_CTR_AUXINT);
1083 if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
1084 pr_warn("Can't write CTR while resetting\n");
1087 * Disable MUX mode if present.
1090 if (i8042_mux_present)
1091 i8042_set_mux_mode(false, NULL);
1094 * Reset the controller if requested.
1097 if (i8042_reset == I8042_RESET_ALWAYS ||
1098 (i8042_reset == I8042_RESET_ON_S2RAM && s2r_wants_reset)) {
1099 i8042_controller_selftest();
1103 * Restore the original control register setting.
1106 if (i8042_command(&i8042_initial_ctr, I8042_CMD_CTL_WCTR))
1107 pr_warn("Can't restore CTR\n");
1112 * i8042_panic_blink() will turn the keyboard LEDs on or off and is called
1113 * when kernel panics. Flashing LEDs is useful for users running X who may
1114 * not see the console and will help distinguishing panics from "real"
1117 * Note that DELAY has a limit of 10ms so we will not get stuck here
1118 * waiting for KBC to free up even if KBD interrupt is off
1121 #define DELAY do { mdelay(1); if (++delay > 10) return delay; } while(0)
1123 static long i8042_panic_blink(int state)
1128 led = (state) ? 0x01 | 0x04 : 0;
1129 while (i8042_read_status() & I8042_STR_IBF)
1131 dbg("%02x -> i8042 (panic blink)\n", 0xed);
1132 i8042_suppress_kbd_ack = 2;
1133 i8042_write_data(0xed); /* set leds */
1135 while (i8042_read_status() & I8042_STR_IBF)
1138 dbg("%02x -> i8042 (panic blink)\n", led);
1139 i8042_write_data(led);
1147 static void i8042_dritek_enable(void)
1149 unsigned char param = 0x90;
1152 error = i8042_command(¶m, 0x1059);
1154 pr_warn("Failed to enable DRITEK extension: %d\n", error);
1161 * Here we try to reset everything back to a state we had
1162 * before suspending.
1165 static int i8042_controller_resume(bool s2r_wants_reset)
1169 error = i8042_controller_check();
1173 if (i8042_reset == I8042_RESET_ALWAYS ||
1174 (i8042_reset == I8042_RESET_ON_S2RAM && s2r_wants_reset)) {
1175 error = i8042_controller_selftest();
1181 * Restore original CTR value and disable all ports
1184 i8042_ctr = i8042_initial_ctr;
1186 i8042_ctr &= ~I8042_CTR_XLATE;
1187 i8042_ctr |= I8042_CTR_AUXDIS | I8042_CTR_KBDDIS;
1188 i8042_ctr &= ~(I8042_CTR_AUXINT | I8042_CTR_KBDINT);
1189 if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
1190 pr_warn("Can't write CTR to resume, retrying...\n");
1192 if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
1193 pr_err("CTR write retry failed\n");
1201 i8042_dritek_enable();
1204 if (i8042_mux_present) {
1205 if (i8042_set_mux_mode(true, NULL) || i8042_enable_mux_ports())
1206 pr_warn("failed to resume active multiplexor, mouse won't work\n");
1207 } else if (i8042_ports[I8042_AUX_PORT_NO].serio)
1208 i8042_enable_aux_port();
1210 if (i8042_ports[I8042_KBD_PORT_NO].serio)
1211 i8042_enable_kbd_port();
1213 i8042_interrupt(0, NULL);
1219 * Here we try to restore the original BIOS settings to avoid
1223 static int i8042_pm_suspend(struct device *dev)
1227 if (pm_suspend_via_firmware())
1228 i8042_controller_reset(true);
1230 /* Set up serio interrupts for system wakeup. */
1231 for (i = 0; i < I8042_NUM_PORTS; i++) {
1232 struct serio *serio = i8042_ports[i].serio;
1234 if (serio && device_may_wakeup(&serio->dev))
1235 enable_irq_wake(i8042_ports[i].irq);
1241 static int i8042_pm_resume_noirq(struct device *dev)
1243 if (!pm_resume_via_firmware())
1244 i8042_interrupt(0, NULL);
1249 static int i8042_pm_resume(struct device *dev)
1254 for (i = 0; i < I8042_NUM_PORTS; i++) {
1255 struct serio *serio = i8042_ports[i].serio;
1257 if (serio && device_may_wakeup(&serio->dev))
1258 disable_irq_wake(i8042_ports[i].irq);
1262 * If platform firmware was not going to be involved in suspend, we did
1263 * not restore the controller state to whatever it had been at boot
1264 * time, so we do not need to do anything.
1266 if (!pm_suspend_via_firmware())
1270 * We only need to reset the controller if we are resuming after handing
1271 * off control to the platform firmware, otherwise we can simply restore
1274 want_reset = pm_resume_via_firmware();
1276 return i8042_controller_resume(want_reset);
1279 static int i8042_pm_thaw(struct device *dev)
1281 i8042_interrupt(0, NULL);
1286 static int i8042_pm_reset(struct device *dev)
1288 i8042_controller_reset(false);
1293 static int i8042_pm_restore(struct device *dev)
1295 return i8042_controller_resume(false);
1298 static const struct dev_pm_ops i8042_pm_ops = {
1299 .suspend = i8042_pm_suspend,
1300 .resume_noirq = i8042_pm_resume_noirq,
1301 .resume = i8042_pm_resume,
1302 .thaw = i8042_pm_thaw,
1303 .poweroff = i8042_pm_reset,
1304 .restore = i8042_pm_restore,
1307 #endif /* CONFIG_PM */
1310 * We need to reset the 8042 back to original mode on system shutdown,
1311 * because otherwise BIOSes will be confused.
1314 static void i8042_shutdown(struct platform_device *dev)
1316 i8042_controller_reset(false);
1319 static int __init i8042_create_kbd_port(void)
1321 struct serio *serio;
1322 struct i8042_port *port = &i8042_ports[I8042_KBD_PORT_NO];
1324 serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
1328 serio->id.type = i8042_direct ? SERIO_8042 : SERIO_8042_XL;
1329 serio->write = i8042_dumbkbd ? NULL : i8042_kbd_write;
1330 serio->start = i8042_start;
1331 serio->stop = i8042_stop;
1332 serio->close = i8042_port_close;
1333 serio->ps2_cmd_mutex = &i8042_mutex;
1334 serio->port_data = port;
1335 serio->dev.parent = &i8042_platform_device->dev;
1336 strlcpy(serio->name, "i8042 KBD port", sizeof(serio->name));
1337 strlcpy(serio->phys, I8042_KBD_PHYS_DESC, sizeof(serio->phys));
1338 strlcpy(serio->firmware_id, i8042_kbd_firmware_id,
1339 sizeof(serio->firmware_id));
1340 set_primary_fwnode(&serio->dev, i8042_kbd_fwnode);
1342 port->serio = serio;
1343 port->irq = I8042_KBD_IRQ;
1348 static int __init i8042_create_aux_port(int idx)
1350 struct serio *serio;
1351 int port_no = idx < 0 ? I8042_AUX_PORT_NO : I8042_MUX_PORT_NO + idx;
1352 struct i8042_port *port = &i8042_ports[port_no];
1354 serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
1358 serio->id.type = SERIO_8042;
1359 serio->write = i8042_aux_write;
1360 serio->start = i8042_start;
1361 serio->stop = i8042_stop;
1362 serio->ps2_cmd_mutex = &i8042_mutex;
1363 serio->port_data = port;
1364 serio->dev.parent = &i8042_platform_device->dev;
1366 strlcpy(serio->name, "i8042 AUX port", sizeof(serio->name));
1367 strlcpy(serio->phys, I8042_AUX_PHYS_DESC, sizeof(serio->phys));
1368 strlcpy(serio->firmware_id, i8042_aux_firmware_id,
1369 sizeof(serio->firmware_id));
1370 serio->close = i8042_port_close;
1372 snprintf(serio->name, sizeof(serio->name), "i8042 AUX%d port", idx);
1373 snprintf(serio->phys, sizeof(serio->phys), I8042_MUX_PHYS_DESC, idx + 1);
1374 strlcpy(serio->firmware_id, i8042_aux_firmware_id,
1375 sizeof(serio->firmware_id));
1378 port->serio = serio;
1380 port->irq = I8042_AUX_IRQ;
1385 static void __init i8042_free_kbd_port(void)
1387 kfree(i8042_ports[I8042_KBD_PORT_NO].serio);
1388 i8042_ports[I8042_KBD_PORT_NO].serio = NULL;
1391 static void __init i8042_free_aux_ports(void)
1395 for (i = I8042_AUX_PORT_NO; i < I8042_NUM_PORTS; i++) {
1396 kfree(i8042_ports[i].serio);
1397 i8042_ports[i].serio = NULL;
1401 static void __init i8042_register_ports(void)
1405 for (i = 0; i < I8042_NUM_PORTS; i++) {
1406 struct serio *serio = i8042_ports[i].serio;
1411 printk(KERN_INFO "serio: %s at %#lx,%#lx irq %d\n",
1413 (unsigned long) I8042_DATA_REG,
1414 (unsigned long) I8042_COMMAND_REG,
1415 i8042_ports[i].irq);
1416 serio_register_port(serio);
1420 static void i8042_unregister_ports(void)
1424 for (i = 0; i < I8042_NUM_PORTS; i++) {
1425 if (i8042_ports[i].serio) {
1426 serio_unregister_port(i8042_ports[i].serio);
1427 i8042_ports[i].serio = NULL;
1432 static void i8042_free_irqs(void)
1434 if (i8042_aux_irq_registered)
1435 free_irq(I8042_AUX_IRQ, i8042_platform_device);
1436 if (i8042_kbd_irq_registered)
1437 free_irq(I8042_KBD_IRQ, i8042_platform_device);
1439 i8042_aux_irq_registered = i8042_kbd_irq_registered = false;
1442 static int __init i8042_setup_aux(void)
1444 int (*aux_enable)(void);
1448 if (i8042_check_aux())
1451 if (i8042_nomux || i8042_check_mux()) {
1452 error = i8042_create_aux_port(-1);
1454 goto err_free_ports;
1455 aux_enable = i8042_enable_aux_port;
1457 for (i = 0; i < I8042_NUM_MUX_PORTS; i++) {
1458 error = i8042_create_aux_port(i);
1460 goto err_free_ports;
1462 aux_enable = i8042_enable_mux_ports;
1465 error = request_irq(I8042_AUX_IRQ, i8042_interrupt, IRQF_SHARED,
1466 "i8042", i8042_platform_device);
1468 goto err_free_ports;
1473 i8042_aux_irq_registered = true;
1477 free_irq(I8042_AUX_IRQ, i8042_platform_device);
1479 i8042_free_aux_ports();
1483 static int __init i8042_setup_kbd(void)
1487 error = i8042_create_kbd_port();
1491 error = request_irq(I8042_KBD_IRQ, i8042_interrupt, IRQF_SHARED,
1492 "i8042", i8042_platform_device);
1496 error = i8042_enable_kbd_port();
1500 i8042_kbd_irq_registered = true;
1504 free_irq(I8042_KBD_IRQ, i8042_platform_device);
1506 i8042_free_kbd_port();
1510 static int i8042_kbd_bind_notifier(struct notifier_block *nb,
1511 unsigned long action, void *data)
1513 struct device *dev = data;
1514 struct serio *serio = to_serio_port(dev);
1515 struct i8042_port *port = serio->port_data;
1517 if (serio != i8042_ports[I8042_KBD_PORT_NO].serio)
1521 case BUS_NOTIFY_BOUND_DRIVER:
1522 port->driver_bound = true;
1525 case BUS_NOTIFY_UNBIND_DRIVER:
1526 port->driver_bound = false;
1533 static int __init i8042_probe(struct platform_device *dev)
1537 i8042_platform_device = dev;
1539 if (i8042_reset == I8042_RESET_ALWAYS) {
1540 error = i8042_controller_selftest();
1545 error = i8042_controller_init();
1551 i8042_dritek_enable();
1555 error = i8042_setup_aux();
1556 if (error && error != -ENODEV && error != -EBUSY)
1561 error = i8042_setup_kbd();
1566 * Ok, everything is ready, let's register all serio ports
1568 i8042_register_ports();
1573 i8042_free_aux_ports(); /* in case KBD failed but AUX not */
1575 i8042_controller_reset(false);
1576 i8042_platform_device = NULL;
1581 static int i8042_remove(struct platform_device *dev)
1583 i8042_unregister_ports();
1585 i8042_controller_reset(false);
1586 i8042_platform_device = NULL;
1591 static struct platform_driver i8042_driver = {
1595 .pm = &i8042_pm_ops,
1598 .remove = i8042_remove,
1599 .shutdown = i8042_shutdown,
1602 static struct notifier_block i8042_kbd_bind_notifier_block = {
1603 .notifier_call = i8042_kbd_bind_notifier,
1606 static int __init i8042_init(void)
1608 struct platform_device *pdev;
1613 err = i8042_platform_init();
1617 err = i8042_controller_check();
1619 goto err_platform_exit;
1621 pdev = platform_create_bundle(&i8042_driver, i8042_probe, NULL, 0, NULL, 0);
1623 err = PTR_ERR(pdev);
1624 goto err_platform_exit;
1627 bus_register_notifier(&serio_bus, &i8042_kbd_bind_notifier_block);
1628 panic_blink = i8042_panic_blink;
1633 i8042_platform_exit();
1637 static void __exit i8042_exit(void)
1639 platform_device_unregister(i8042_platform_device);
1640 platform_driver_unregister(&i8042_driver);
1641 i8042_platform_exit();
1643 bus_unregister_notifier(&serio_bus, &i8042_kbd_bind_notifier_block);
1647 module_init(i8042_init);
1648 module_exit(i8042_exit);