2 * i8042 keyboard and mouse controller driver for Linux
4 * Copyright (c) 1999-2004 Vojtech Pavlik
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 as published by
10 * the Free Software Foundation.
13 #include <linux/delay.h>
14 #include <linux/module.h>
15 #include <linux/interrupt.h>
16 #include <linux/ioport.h>
17 #include <linux/init.h>
18 #include <linux/serio.h>
19 #include <linux/err.h>
20 #include <linux/rcupdate.h>
21 #include <linux/platform_device.h>
22 #include <linux/i8042.h>
26 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
27 MODULE_DESCRIPTION("i8042 keyboard and mouse controller driver");
28 MODULE_LICENSE("GPL");
30 static unsigned int i8042_nokbd;
31 module_param_named(nokbd, i8042_nokbd, bool, 0);
32 MODULE_PARM_DESC(nokbd, "Do not probe or use KBD port.");
34 static unsigned int i8042_noaux;
35 module_param_named(noaux, i8042_noaux, bool, 0);
36 MODULE_PARM_DESC(noaux, "Do not probe or use AUX (mouse) port.");
38 static unsigned int i8042_nomux;
39 module_param_named(nomux, i8042_nomux, bool, 0);
40 MODULE_PARM_DESC(nomux, "Do not check whether an active multiplexing conrtoller is present.");
42 static unsigned int i8042_unlock;
43 module_param_named(unlock, i8042_unlock, bool, 0);
44 MODULE_PARM_DESC(unlock, "Ignore keyboard lock.");
46 static unsigned int i8042_reset;
47 module_param_named(reset, i8042_reset, bool, 0);
48 MODULE_PARM_DESC(reset, "Reset controller during init and cleanup.");
50 static unsigned int i8042_direct;
51 module_param_named(direct, i8042_direct, bool, 0);
52 MODULE_PARM_DESC(direct, "Put keyboard port into non-translated mode.");
54 static unsigned int i8042_dumbkbd;
55 module_param_named(dumbkbd, i8042_dumbkbd, bool, 0);
56 MODULE_PARM_DESC(dumbkbd, "Pretend that controller can only read data from keyboard");
58 static unsigned int i8042_noloop;
59 module_param_named(noloop, i8042_noloop, bool, 0);
60 MODULE_PARM_DESC(noloop, "Disable the AUX Loopback command while probing for the AUX port");
62 static unsigned int i8042_blink_frequency = 500;
63 module_param_named(panicblink, i8042_blink_frequency, uint, 0600);
64 MODULE_PARM_DESC(panicblink, "Frequency with which keyboard LEDs should blink when kernel panics");
67 static unsigned int i8042_dritek;
68 module_param_named(dritek, i8042_dritek, bool, 0);
69 MODULE_PARM_DESC(dritek, "Force enable the Dritek keyboard extension");
73 static int i8042_nopnp;
74 module_param_named(nopnp, i8042_nopnp, bool, 0);
75 MODULE_PARM_DESC(nopnp, "Do not use PNP to detect controller settings");
80 static int i8042_debug;
81 module_param_named(debug, i8042_debug, bool, 0600);
82 MODULE_PARM_DESC(debug, "Turn i8042 debugging mode on and off");
87 static DEFINE_SPINLOCK(i8042_lock);
96 #define I8042_KBD_PORT_NO 0
97 #define I8042_AUX_PORT_NO 1
98 #define I8042_MUX_PORT_NO 2
99 #define I8042_NUM_PORTS (I8042_NUM_MUX_PORTS + 2)
101 static struct i8042_port i8042_ports[I8042_NUM_PORTS];
103 static unsigned char i8042_initial_ctr;
104 static unsigned char i8042_ctr;
105 static unsigned char i8042_mux_present;
106 static unsigned char i8042_kbd_irq_registered;
107 static unsigned char i8042_aux_irq_registered;
108 static unsigned char i8042_suppress_kbd_ack;
109 static struct platform_device *i8042_platform_device;
111 static irqreturn_t i8042_interrupt(int irq, void *dev_id);
114 * The i8042_wait_read() and i8042_wait_write functions wait for the i8042 to
115 * be ready for reading values from it / writing values to it.
116 * Called always with i8042_lock held.
119 static int i8042_wait_read(void)
123 while ((~i8042_read_status() & I8042_STR_OBF) && (i < I8042_CTL_TIMEOUT)) {
127 return -(i == I8042_CTL_TIMEOUT);
130 static int i8042_wait_write(void)
134 while ((i8042_read_status() & I8042_STR_IBF) && (i < I8042_CTL_TIMEOUT)) {
138 return -(i == I8042_CTL_TIMEOUT);
142 * i8042_flush() flushes all data that may be in the keyboard and mouse buffers
143 * of the i8042 down the toilet.
146 static int i8042_flush(void)
149 unsigned char data, str;
152 spin_lock_irqsave(&i8042_lock, flags);
154 while (((str = i8042_read_status()) & I8042_STR_OBF) && (i < I8042_BUFFER_SIZE)) {
156 data = i8042_read_data();
158 dbg("%02x <- i8042 (flush, %s)", data,
159 str & I8042_STR_AUXDATA ? "aux" : "kbd");
162 spin_unlock_irqrestore(&i8042_lock, flags);
168 * i8042_command() executes a command on the i8042. It also sends the input
169 * parameter(s) of the commands to it, and receives the output value(s). The
170 * parameters are to be stored in the param array, and the output is placed
171 * into the same array. The number of the parameters and output values is
172 * encoded in bits 8-11 of the command number.
175 static int __i8042_command(unsigned char *param, int command)
179 if (i8042_noloop && command == I8042_CMD_AUX_LOOP)
182 error = i8042_wait_write();
186 dbg("%02x -> i8042 (command)", command & 0xff);
187 i8042_write_command(command & 0xff);
189 for (i = 0; i < ((command >> 12) & 0xf); i++) {
190 error = i8042_wait_write();
193 dbg("%02x -> i8042 (parameter)", param[i]);
194 i8042_write_data(param[i]);
197 for (i = 0; i < ((command >> 8) & 0xf); i++) {
198 error = i8042_wait_read();
200 dbg(" -- i8042 (timeout)");
204 if (command == I8042_CMD_AUX_LOOP &&
205 !(i8042_read_status() & I8042_STR_AUXDATA)) {
206 dbg(" -- i8042 (auxerr)");
210 param[i] = i8042_read_data();
211 dbg("%02x <- i8042 (return)", param[i]);
217 int i8042_command(unsigned char *param, int command)
222 spin_lock_irqsave(&i8042_lock, flags);
223 retval = __i8042_command(param, command);
224 spin_unlock_irqrestore(&i8042_lock, flags);
228 EXPORT_SYMBOL(i8042_command);
231 * i8042_kbd_write() sends a byte out through the keyboard interface.
234 static int i8042_kbd_write(struct serio *port, unsigned char c)
239 spin_lock_irqsave(&i8042_lock, flags);
241 if (!(retval = i8042_wait_write())) {
242 dbg("%02x -> i8042 (kbd-data)", c);
246 spin_unlock_irqrestore(&i8042_lock, flags);
252 * i8042_aux_write() sends a byte out through the aux interface.
255 static int i8042_aux_write(struct serio *serio, unsigned char c)
257 struct i8042_port *port = serio->port_data;
259 return i8042_command(&c, port->mux == -1 ?
261 I8042_CMD_MUX_SEND + port->mux);
265 * i8042_start() is called by serio core when port is about to finish
266 * registering. It will mark port as existing so i8042_interrupt can
267 * start sending data through it.
269 static int i8042_start(struct serio *serio)
271 struct i8042_port *port = serio->port_data;
279 * i8042_stop() marks serio port as non-existing so i8042_interrupt
280 * will not try to send data to the port that is about to go away.
281 * The function is called by serio core as part of unregister procedure.
283 static void i8042_stop(struct serio *serio)
285 struct i8042_port *port = serio->port_data;
290 * We synchronize with both AUX and KBD IRQs because there is
291 * a (very unlikely) chance that AUX IRQ is raised for KBD port
294 synchronize_irq(I8042_AUX_IRQ);
295 synchronize_irq(I8042_KBD_IRQ);
300 * i8042_interrupt() is the most important function in this driver -
301 * it handles the interrupts from the i8042, and sends incoming bytes
302 * to the upper layers.
305 static irqreturn_t i8042_interrupt(int irq, void *dev_id)
307 struct i8042_port *port;
309 unsigned char str, data;
311 unsigned int port_no;
314 spin_lock_irqsave(&i8042_lock, flags);
315 str = i8042_read_status();
316 if (unlikely(~str & I8042_STR_OBF)) {
317 spin_unlock_irqrestore(&i8042_lock, flags);
318 if (irq) dbg("Interrupt %d, without any data", irq);
322 data = i8042_read_data();
323 spin_unlock_irqrestore(&i8042_lock, flags);
325 if (i8042_mux_present && (str & I8042_STR_AUXDATA)) {
326 static unsigned long last_transmit;
327 static unsigned char last_str;
330 if (str & I8042_STR_MUXERR) {
331 dbg("MUX error, status is %02x, data is %02x", str, data);
333 * When MUXERR condition is signalled the data register can only contain
334 * 0xfd, 0xfe or 0xff if implementation follows the spec. Unfortunately
335 * it is not always the case. Some KBCs also report 0xfc when there is
336 * nothing connected to the port while others sometimes get confused which
337 * port the data came from and signal error leaving the data intact. They
338 * _do not_ revert to legacy mode (actually I've never seen KBC reverting
339 * to legacy mode yet, when we see one we'll add proper handling).
340 * Anyway, we process 0xfc, 0xfd, 0xfe and 0xff as timeouts, and for the
341 * rest assume that the data came from the same serio last byte
342 * was transmitted (if transmission happened not too long ago).
347 if (time_before(jiffies, last_transmit + HZ/10)) {
351 /* fall through - report timeout */
354 case 0xfe: dfl = SERIO_TIMEOUT; data = 0xfe; break;
355 case 0xff: dfl = SERIO_PARITY; data = 0xfe; break;
359 port_no = I8042_MUX_PORT_NO + ((str >> 6) & 3);
361 last_transmit = jiffies;
364 dfl = ((str & I8042_STR_PARITY) ? SERIO_PARITY : 0) |
365 ((str & I8042_STR_TIMEOUT) ? SERIO_TIMEOUT : 0);
367 port_no = (str & I8042_STR_AUXDATA) ?
368 I8042_AUX_PORT_NO : I8042_KBD_PORT_NO;
371 port = &i8042_ports[port_no];
373 dbg("%02x <- i8042 (interrupt, %d, %d%s%s)",
375 dfl & SERIO_PARITY ? ", bad parity" : "",
376 dfl & SERIO_TIMEOUT ? ", timeout" : "");
378 if (unlikely(i8042_suppress_kbd_ack))
379 if (port_no == I8042_KBD_PORT_NO &&
380 (data == 0xfa || data == 0xfe)) {
381 i8042_suppress_kbd_ack--;
385 if (likely(port->exists))
386 serio_interrupt(port->serio, data, dfl);
389 return IRQ_RETVAL(ret);
393 * i8042_enable_kbd_port enables keybaord port on chip
396 static int i8042_enable_kbd_port(void)
398 i8042_ctr &= ~I8042_CTR_KBDDIS;
399 i8042_ctr |= I8042_CTR_KBDINT;
401 if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
402 i8042_ctr &= ~I8042_CTR_KBDINT;
403 i8042_ctr |= I8042_CTR_KBDDIS;
404 printk(KERN_ERR "i8042.c: Failed to enable KBD port.\n");
412 * i8042_enable_aux_port enables AUX (mouse) port on chip
415 static int i8042_enable_aux_port(void)
417 i8042_ctr &= ~I8042_CTR_AUXDIS;
418 i8042_ctr |= I8042_CTR_AUXINT;
420 if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
421 i8042_ctr &= ~I8042_CTR_AUXINT;
422 i8042_ctr |= I8042_CTR_AUXDIS;
423 printk(KERN_ERR "i8042.c: Failed to enable AUX port.\n");
431 * i8042_enable_mux_ports enables 4 individual AUX ports after
432 * the controller has been switched into Multiplexed mode
435 static int i8042_enable_mux_ports(void)
440 for (i = 0; i < I8042_NUM_MUX_PORTS; i++) {
441 i8042_command(¶m, I8042_CMD_MUX_PFX + i);
442 i8042_command(¶m, I8042_CMD_AUX_ENABLE);
445 return i8042_enable_aux_port();
449 * i8042_set_mux_mode checks whether the controller has an active
450 * multiplexor and puts the chip into Multiplexed (1) or Legacy (0) mode.
453 static int i8042_set_mux_mode(unsigned int mode, unsigned char *mux_version)
458 * Get rid of bytes in the queue.
464 * Internal loopback test - send three bytes, they should come back from the
465 * mouse interface, the last should be version.
469 if (i8042_command(¶m, I8042_CMD_AUX_LOOP) || param != 0xf0)
471 param = mode ? 0x56 : 0xf6;
472 if (i8042_command(¶m, I8042_CMD_AUX_LOOP) || param != (mode ? 0x56 : 0xf6))
474 param = mode ? 0xa4 : 0xa5;
475 if (i8042_command(¶m, I8042_CMD_AUX_LOOP) || param == (mode ? 0xa4 : 0xa5))
479 *mux_version = param;
485 * i8042_check_mux() checks whether the controller supports the PS/2 Active
486 * Multiplexing specification by Synaptics, Phoenix, Insyde and
490 static int __devinit i8042_check_mux(void)
492 unsigned char mux_version;
494 if (i8042_set_mux_mode(1, &mux_version))
498 * Workaround for interference with USB Legacy emulation
499 * that causes a v10.12 MUX to be found.
501 if (mux_version == 0xAC)
504 printk(KERN_INFO "i8042.c: Detected active multiplexing controller, rev %d.%d.\n",
505 (mux_version >> 4) & 0xf, mux_version & 0xf);
508 * Disable all muxed ports by disabling AUX.
510 i8042_ctr |= I8042_CTR_AUXDIS;
511 i8042_ctr &= ~I8042_CTR_AUXINT;
513 if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
514 printk(KERN_ERR "i8042.c: Failed to disable AUX port, can't use MUX.\n");
518 i8042_mux_present = 1;
524 * The following is used to test AUX IRQ delivery.
526 static struct completion i8042_aux_irq_delivered __devinitdata;
527 static int i8042_irq_being_tested __devinitdata;
529 static irqreturn_t __devinit i8042_aux_test_irq(int irq, void *dev_id)
532 unsigned char str, data;
535 spin_lock_irqsave(&i8042_lock, flags);
536 str = i8042_read_status();
537 if (str & I8042_STR_OBF) {
538 data = i8042_read_data();
539 if (i8042_irq_being_tested &&
540 data == 0xa5 && (str & I8042_STR_AUXDATA))
541 complete(&i8042_aux_irq_delivered);
544 spin_unlock_irqrestore(&i8042_lock, flags);
546 return IRQ_RETVAL(ret);
550 * i8042_toggle_aux - enables or disables AUX port on i8042 via command and
551 * verifies success by readinng CTR. Used when testing for presence of AUX
554 static int __devinit i8042_toggle_aux(int on)
559 if (i8042_command(¶m,
560 on ? I8042_CMD_AUX_ENABLE : I8042_CMD_AUX_DISABLE))
563 /* some chips need some time to set the I8042_CTR_AUXDIS bit */
564 for (i = 0; i < 100; i++) {
567 if (i8042_command(¶m, I8042_CMD_CTL_RCTR))
570 if (!(param & I8042_CTR_AUXDIS) == on)
578 * i8042_check_aux() applies as much paranoia as it can at detecting
579 * the presence of an AUX interface.
582 static int __devinit i8042_check_aux(void)
585 int irq_registered = 0;
586 int aux_loop_broken = 0;
591 * Get rid of bytes in the queue.
597 * Internal loopback test - filters out AT-type i8042's. Unfortunately
598 * SiS screwed up and their 5597 doesn't support the LOOP command even
599 * though it has an AUX port.
603 retval = i8042_command(¶m, I8042_CMD_AUX_LOOP);
604 if (retval || param != 0x5a) {
607 * External connection test - filters out AT-soldered PS/2 i8042's
608 * 0x00 - no error, 0x01-0x03 - clock/data stuck, 0xff - general error
609 * 0xfa - no error on some notebooks which ignore the spec
610 * Because it's common for chipsets to return error on perfectly functioning
611 * AUX ports, we test for this only when the LOOP command failed.
614 if (i8042_command(¶m, I8042_CMD_AUX_TEST) ||
615 (param && param != 0xfa && param != 0xff))
619 * If AUX_LOOP completed without error but returned unexpected data
627 * Bit assignment test - filters out PS/2 i8042's in AT mode
630 if (i8042_toggle_aux(0)) {
631 printk(KERN_WARNING "Failed to disable AUX port, but continuing anyway... Is this a SiS?\n");
632 printk(KERN_WARNING "If AUX port is really absent please use the 'i8042.noaux' option.\n");
635 if (i8042_toggle_aux(1))
639 * Test AUX IRQ delivery to make sure BIOS did not grab the IRQ and
640 * used it for a PCI card or somethig else.
643 if (i8042_noloop || aux_loop_broken) {
645 * Without LOOP command we can't test AUX IRQ delivery. Assume the port
646 * is working and hope we are right.
652 if (request_irq(I8042_AUX_IRQ, i8042_aux_test_irq, IRQF_SHARED,
653 "i8042", i8042_platform_device))
658 if (i8042_enable_aux_port())
661 spin_lock_irqsave(&i8042_lock, flags);
663 init_completion(&i8042_aux_irq_delivered);
664 i8042_irq_being_tested = 1;
667 retval = __i8042_command(¶m, I8042_CMD_AUX_LOOP & 0xf0ff);
669 spin_unlock_irqrestore(&i8042_lock, flags);
674 if (wait_for_completion_timeout(&i8042_aux_irq_delivered,
675 msecs_to_jiffies(250)) == 0) {
677 * AUX IRQ was never delivered so we need to flush the controller to
678 * get rid of the byte we put there; otherwise keyboard may not work.
687 * Disable the interface.
690 i8042_ctr |= I8042_CTR_AUXDIS;
691 i8042_ctr &= ~I8042_CTR_AUXINT;
693 if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
697 free_irq(I8042_AUX_IRQ, i8042_platform_device);
702 static int i8042_controller_check(void)
704 if (i8042_flush() == I8042_BUFFER_SIZE) {
705 printk(KERN_ERR "i8042.c: No controller found.\n");
712 static int i8042_controller_selftest(void)
719 if (i8042_command(¶m, I8042_CMD_CTL_TEST)) {
720 printk(KERN_ERR "i8042.c: i8042 controller self test timeout.\n");
724 if (param != I8042_RET_CTL_TEST) {
725 printk(KERN_ERR "i8042.c: i8042 controller selftest failed. (%#x != %#x)\n",
726 param, I8042_RET_CTL_TEST);
734 * i8042_controller init initializes the i8042 controller, and,
735 * most importantly, sets it into non-xlated mode if that's
739 static int i8042_controller_init(void)
744 * Save the CTR for restoral on unload / reboot.
747 if (i8042_command(&i8042_ctr, I8042_CMD_CTL_RCTR)) {
748 printk(KERN_ERR "i8042.c: Can't read CTR while initializing i8042.\n");
752 i8042_initial_ctr = i8042_ctr;
755 * Disable the keyboard interface and interrupt.
758 i8042_ctr |= I8042_CTR_KBDDIS;
759 i8042_ctr &= ~I8042_CTR_KBDINT;
765 spin_lock_irqsave(&i8042_lock, flags);
766 if (~i8042_read_status() & I8042_STR_KEYLOCK) {
768 i8042_ctr |= I8042_CTR_IGNKEYLOCK;
770 printk(KERN_WARNING "i8042.c: Warning: Keylock active.\n");
772 spin_unlock_irqrestore(&i8042_lock, flags);
775 * If the chip is configured into nontranslated mode by the BIOS, don't
776 * bother enabling translating and be happy.
779 if (~i8042_ctr & I8042_CTR_XLATE)
783 * Set nontranslated mode for the kbd interface if requested by an option.
784 * After this the kbd interface becomes a simple serial in/out, like the aux
785 * interface is. We don't do this by default, since it can confuse notebook
790 i8042_ctr &= ~I8042_CTR_XLATE;
796 if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
797 printk(KERN_ERR "i8042.c: Can't write CTR while initializing i8042.\n");
806 * Reset the controller and reset CRT to the original value set by BIOS.
809 static void i8042_controller_reset(void)
814 * Disable both KBD and AUX interfaces so they don't get in the way
817 i8042_ctr |= I8042_CTR_KBDDIS | I8042_CTR_AUXDIS;
818 i8042_ctr &= ~(I8042_CTR_KBDINT | I8042_CTR_AUXINT);
821 * Disable MUX mode if present.
824 if (i8042_mux_present)
825 i8042_set_mux_mode(0, NULL);
828 * Reset the controller if requested.
831 i8042_controller_selftest();
834 * Restore the original control register setting.
837 if (i8042_command(&i8042_initial_ctr, I8042_CMD_CTL_WCTR))
838 printk(KERN_WARNING "i8042.c: Can't restore CTR.\n");
843 * i8042_panic_blink() will flash the keyboard LEDs and is called when
844 * kernel panics. Flashing LEDs is useful for users running X who may
845 * not see the console and will help distingushing panics from "real"
848 * Note that DELAY has a limit of 10ms so we will not get stuck here
849 * waiting for KBC to free up even if KBD interrupt is off
852 #define DELAY do { mdelay(1); if (++delay > 10) return delay; } while(0)
854 static long i8042_panic_blink(long count)
857 static long last_blink;
861 * We expect frequency to be about 1/2s. KDB uses about 1s.
862 * Make sure they are different.
864 if (!i8042_blink_frequency)
866 if (count - last_blink < i8042_blink_frequency)
870 while (i8042_read_status() & I8042_STR_IBF)
872 dbg("%02x -> i8042 (panic blink)", 0xed);
873 i8042_suppress_kbd_ack = 2;
874 i8042_write_data(0xed); /* set leds */
876 while (i8042_read_status() & I8042_STR_IBF)
879 dbg("%02x -> i8042 (panic blink)", led);
880 i8042_write_data(led);
889 static void i8042_dritek_enable(void)
894 error = i8042_command(¶m, 0x1059);
897 "Failed to enable DRITEK extension: %d\n",
904 * Here we try to restore the original BIOS settings. We only want to
905 * do that once, when we really suspend, not when we taking memory
906 * snapshot for swsusp (in this case we'll perform required cleanup
907 * as part of shutdown process).
910 static int i8042_suspend(struct platform_device *dev, pm_message_t state)
912 if (dev->dev.power.power_state.event != state.event) {
913 if (state.event == PM_EVENT_SUSPEND)
914 i8042_controller_reset();
916 dev->dev.power.power_state = state;
924 * Here we try to reset everything back to a state in which suspended
927 static int i8042_resume(struct platform_device *dev)
932 * Do not bother with restoring state if we haven't suspened yet
934 if (dev->dev.power.power_state.event == PM_EVENT_ON)
937 error = i8042_controller_check();
941 error = i8042_controller_selftest();
946 * Restore original CTR value and disable all ports
949 i8042_ctr = i8042_initial_ctr;
951 i8042_ctr &= ~I8042_CTR_XLATE;
952 i8042_ctr |= I8042_CTR_AUXDIS | I8042_CTR_KBDDIS;
953 i8042_ctr &= ~(I8042_CTR_AUXINT | I8042_CTR_KBDINT);
954 if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
955 printk(KERN_ERR "i8042: Can't write CTR to resume\n");
962 i8042_dritek_enable();
965 if (i8042_mux_present) {
966 if (i8042_set_mux_mode(1, NULL) || i8042_enable_mux_ports())
968 "i8042: failed to resume active multiplexor, "
969 "mouse won't work.\n");
970 } else if (i8042_ports[I8042_AUX_PORT_NO].serio)
971 i8042_enable_aux_port();
973 if (i8042_ports[I8042_KBD_PORT_NO].serio)
974 i8042_enable_kbd_port();
976 i8042_interrupt(0, NULL);
978 dev->dev.power.power_state = PMSG_ON;
982 #endif /* CONFIG_PM */
985 * We need to reset the 8042 back to original mode on system shutdown,
986 * because otherwise BIOSes will be confused.
989 static void i8042_shutdown(struct platform_device *dev)
991 i8042_controller_reset();
994 static int __devinit i8042_create_kbd_port(void)
997 struct i8042_port *port = &i8042_ports[I8042_KBD_PORT_NO];
999 serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
1003 serio->id.type = i8042_direct ? SERIO_8042 : SERIO_8042_XL;
1004 serio->write = i8042_dumbkbd ? NULL : i8042_kbd_write;
1005 serio->start = i8042_start;
1006 serio->stop = i8042_stop;
1007 serio->port_data = port;
1008 serio->dev.parent = &i8042_platform_device->dev;
1009 strlcpy(serio->name, "i8042 KBD port", sizeof(serio->name));
1010 strlcpy(serio->phys, I8042_KBD_PHYS_DESC, sizeof(serio->phys));
1012 port->serio = serio;
1013 port->irq = I8042_KBD_IRQ;
1018 static int __devinit i8042_create_aux_port(int idx)
1020 struct serio *serio;
1021 int port_no = idx < 0 ? I8042_AUX_PORT_NO : I8042_MUX_PORT_NO + idx;
1022 struct i8042_port *port = &i8042_ports[port_no];
1024 serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
1028 serio->id.type = SERIO_8042;
1029 serio->write = i8042_aux_write;
1030 serio->start = i8042_start;
1031 serio->stop = i8042_stop;
1032 serio->port_data = port;
1033 serio->dev.parent = &i8042_platform_device->dev;
1035 strlcpy(serio->name, "i8042 AUX port", sizeof(serio->name));
1036 strlcpy(serio->phys, I8042_AUX_PHYS_DESC, sizeof(serio->phys));
1038 snprintf(serio->name, sizeof(serio->name), "i8042 AUX%d port", idx);
1039 snprintf(serio->phys, sizeof(serio->phys), I8042_MUX_PHYS_DESC, idx + 1);
1042 port->serio = serio;
1044 port->irq = I8042_AUX_IRQ;
1049 static void __devinit i8042_free_kbd_port(void)
1051 kfree(i8042_ports[I8042_KBD_PORT_NO].serio);
1052 i8042_ports[I8042_KBD_PORT_NO].serio = NULL;
1055 static void __devinit i8042_free_aux_ports(void)
1059 for (i = I8042_AUX_PORT_NO; i < I8042_NUM_PORTS; i++) {
1060 kfree(i8042_ports[i].serio);
1061 i8042_ports[i].serio = NULL;
1065 static void __devinit i8042_register_ports(void)
1069 for (i = 0; i < I8042_NUM_PORTS; i++) {
1070 if (i8042_ports[i].serio) {
1071 printk(KERN_INFO "serio: %s at %#lx,%#lx irq %d\n",
1072 i8042_ports[i].serio->name,
1073 (unsigned long) I8042_DATA_REG,
1074 (unsigned long) I8042_COMMAND_REG,
1075 i8042_ports[i].irq);
1076 serio_register_port(i8042_ports[i].serio);
1081 static void __devexit i8042_unregister_ports(void)
1085 for (i = 0; i < I8042_NUM_PORTS; i++) {
1086 if (i8042_ports[i].serio) {
1087 serio_unregister_port(i8042_ports[i].serio);
1088 i8042_ports[i].serio = NULL;
1093 static void i8042_free_irqs(void)
1095 if (i8042_aux_irq_registered)
1096 free_irq(I8042_AUX_IRQ, i8042_platform_device);
1097 if (i8042_kbd_irq_registered)
1098 free_irq(I8042_KBD_IRQ, i8042_platform_device);
1100 i8042_aux_irq_registered = i8042_kbd_irq_registered = 0;
1103 static int __devinit i8042_setup_aux(void)
1105 int (*aux_enable)(void);
1109 if (i8042_check_aux())
1112 if (i8042_nomux || i8042_check_mux()) {
1113 error = i8042_create_aux_port(-1);
1115 goto err_free_ports;
1116 aux_enable = i8042_enable_aux_port;
1118 for (i = 0; i < I8042_NUM_MUX_PORTS; i++) {
1119 error = i8042_create_aux_port(i);
1121 goto err_free_ports;
1123 aux_enable = i8042_enable_mux_ports;
1126 error = request_irq(I8042_AUX_IRQ, i8042_interrupt, IRQF_SHARED,
1127 "i8042", i8042_platform_device);
1129 goto err_free_ports;
1134 i8042_aux_irq_registered = 1;
1138 free_irq(I8042_AUX_IRQ, i8042_platform_device);
1140 i8042_free_aux_ports();
1144 static int __devinit i8042_setup_kbd(void)
1148 error = i8042_create_kbd_port();
1152 error = request_irq(I8042_KBD_IRQ, i8042_interrupt, IRQF_SHARED,
1153 "i8042", i8042_platform_device);
1157 error = i8042_enable_kbd_port();
1161 i8042_kbd_irq_registered = 1;
1165 free_irq(I8042_KBD_IRQ, i8042_platform_device);
1167 i8042_free_kbd_port();
1171 static int __devinit i8042_probe(struct platform_device *dev)
1175 error = i8042_controller_selftest();
1179 error = i8042_controller_init();
1185 i8042_dritek_enable();
1189 error = i8042_setup_aux();
1190 if (error && error != -ENODEV && error != -EBUSY)
1195 error = i8042_setup_kbd();
1200 * Ok, everything is ready, let's register all serio ports
1202 i8042_register_ports();
1207 i8042_free_aux_ports(); /* in case KBD failed but AUX not */
1209 i8042_controller_reset();
1214 static int __devexit i8042_remove(struct platform_device *dev)
1216 i8042_unregister_ports();
1218 i8042_controller_reset();
1223 static struct platform_driver i8042_driver = {
1226 .owner = THIS_MODULE,
1228 .probe = i8042_probe,
1229 .remove = __devexit_p(i8042_remove),
1230 .shutdown = i8042_shutdown,
1232 .suspend = i8042_suspend,
1233 .resume = i8042_resume,
1237 static int __init i8042_init(void)
1243 err = i8042_platform_init();
1247 err = i8042_controller_check();
1249 goto err_platform_exit;
1251 err = platform_driver_register(&i8042_driver);
1253 goto err_platform_exit;
1255 i8042_platform_device = platform_device_alloc("i8042", -1);
1256 if (!i8042_platform_device) {
1258 goto err_unregister_driver;
1261 err = platform_device_add(i8042_platform_device);
1263 goto err_free_device;
1265 panic_blink = i8042_panic_blink;
1270 platform_device_put(i8042_platform_device);
1271 err_unregister_driver:
1272 platform_driver_unregister(&i8042_driver);
1274 i8042_platform_exit();
1279 static void __exit i8042_exit(void)
1281 platform_device_unregister(i8042_platform_device);
1282 platform_driver_unregister(&i8042_driver);
1283 i8042_platform_exit();
1288 module_init(i8042_init);
1289 module_exit(i8042_exit);