d2ada5597d
The i8042 driver fails detection of the AUX port with some chips, because they apparently do not change the I8042_CTR_AUXDIS bit immediately. This is known to affect at least HP500/HP510 notebooks, consequently the built-in touchpad will not work. The patch will simply reread the value until it gets the expected value or a retry limit is hit, without touching other workaround code in the same area. Signed-off-by: Roland Scheidegger <sroland@tungstengraphics.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
1245 lines
28 KiB
C
1245 lines
28 KiB
C
/*
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* i8042 keyboard and mouse controller driver for Linux
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*
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* Copyright (c) 1999-2004 Vojtech Pavlik
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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/serio.h>
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#include <linux/err.h>
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#include <linux/rcupdate.h>
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#include <linux/platform_device.h>
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#include <asm/io.h>
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MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
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MODULE_DESCRIPTION("i8042 keyboard and mouse controller driver");
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MODULE_LICENSE("GPL");
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static unsigned int i8042_nokbd;
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module_param_named(nokbd, i8042_nokbd, bool, 0);
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MODULE_PARM_DESC(nokbd, "Do not probe or use KBD port.");
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static unsigned int i8042_noaux;
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module_param_named(noaux, i8042_noaux, bool, 0);
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MODULE_PARM_DESC(noaux, "Do not probe or use AUX (mouse) port.");
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static unsigned int i8042_nomux;
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module_param_named(nomux, i8042_nomux, bool, 0);
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MODULE_PARM_DESC(nomux, "Do not check whether an active multiplexing conrtoller is present.");
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static unsigned int i8042_unlock;
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module_param_named(unlock, i8042_unlock, bool, 0);
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MODULE_PARM_DESC(unlock, "Ignore keyboard lock.");
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static unsigned int i8042_reset;
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module_param_named(reset, i8042_reset, bool, 0);
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MODULE_PARM_DESC(reset, "Reset controller during init and cleanup.");
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static unsigned int i8042_direct;
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module_param_named(direct, i8042_direct, bool, 0);
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MODULE_PARM_DESC(direct, "Put keyboard port into non-translated mode.");
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static unsigned int i8042_dumbkbd;
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module_param_named(dumbkbd, i8042_dumbkbd, bool, 0);
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MODULE_PARM_DESC(dumbkbd, "Pretend that controller can only read data from keyboard");
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static unsigned int i8042_noloop;
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module_param_named(noloop, i8042_noloop, bool, 0);
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MODULE_PARM_DESC(noloop, "Disable the AUX Loopback command while probing for the AUX port");
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static unsigned int i8042_blink_frequency = 500;
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module_param_named(panicblink, i8042_blink_frequency, uint, 0600);
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MODULE_PARM_DESC(panicblink, "Frequency with which keyboard LEDs should blink when kernel panics");
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#ifdef CONFIG_PNP
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static int i8042_nopnp;
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module_param_named(nopnp, i8042_nopnp, bool, 0);
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MODULE_PARM_DESC(nopnp, "Do not use PNP to detect controller settings");
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#endif
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#define DEBUG
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#ifdef DEBUG
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static int i8042_debug;
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module_param_named(debug, i8042_debug, bool, 0600);
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MODULE_PARM_DESC(debug, "Turn i8042 debugging mode on and off");
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#endif
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#include "i8042.h"
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static DEFINE_SPINLOCK(i8042_lock);
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struct i8042_port {
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struct serio *serio;
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int irq;
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unsigned char exists;
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signed char mux;
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};
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#define I8042_KBD_PORT_NO 0
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#define I8042_AUX_PORT_NO 1
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#define I8042_MUX_PORT_NO 2
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#define I8042_NUM_PORTS (I8042_NUM_MUX_PORTS + 2)
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static struct i8042_port i8042_ports[I8042_NUM_PORTS];
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static unsigned char i8042_initial_ctr;
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static unsigned char i8042_ctr;
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static unsigned char i8042_mux_present;
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static unsigned char i8042_kbd_irq_registered;
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static unsigned char i8042_aux_irq_registered;
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static unsigned char i8042_suppress_kbd_ack;
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static struct platform_device *i8042_platform_device;
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static irqreturn_t i8042_interrupt(int irq, void *dev_id);
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/*
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* The i8042_wait_read() and i8042_wait_write functions wait for the i8042 to
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* be ready for reading values from it / writing values to it.
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* Called always with i8042_lock held.
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*/
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static int i8042_wait_read(void)
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{
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int i = 0;
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while ((~i8042_read_status() & I8042_STR_OBF) && (i < I8042_CTL_TIMEOUT)) {
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udelay(50);
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i++;
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}
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return -(i == I8042_CTL_TIMEOUT);
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}
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static int i8042_wait_write(void)
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{
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int i = 0;
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while ((i8042_read_status() & I8042_STR_IBF) && (i < I8042_CTL_TIMEOUT)) {
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udelay(50);
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i++;
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}
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return -(i == I8042_CTL_TIMEOUT);
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}
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/*
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* i8042_flush() flushes all data that may be in the keyboard and mouse buffers
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* of the i8042 down the toilet.
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*/
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static int i8042_flush(void)
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{
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unsigned long flags;
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unsigned char data, str;
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int i = 0;
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spin_lock_irqsave(&i8042_lock, flags);
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while (((str = i8042_read_status()) & I8042_STR_OBF) && (i < I8042_BUFFER_SIZE)) {
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udelay(50);
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data = i8042_read_data();
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i++;
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dbg("%02x <- i8042 (flush, %s)", data,
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str & I8042_STR_AUXDATA ? "aux" : "kbd");
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}
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spin_unlock_irqrestore(&i8042_lock, flags);
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return i;
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}
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/*
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* i8042_command() executes a command on the i8042. It also sends the input
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* parameter(s) of the commands to it, and receives the output value(s). The
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* parameters are to be stored in the param array, and the output is placed
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* into the same array. The number of the parameters and output values is
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* encoded in bits 8-11 of the command number.
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*/
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static int __i8042_command(unsigned char *param, int command)
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{
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int i, error;
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if (i8042_noloop && command == I8042_CMD_AUX_LOOP)
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return -1;
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error = i8042_wait_write();
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if (error)
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return error;
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dbg("%02x -> i8042 (command)", command & 0xff);
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i8042_write_command(command & 0xff);
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for (i = 0; i < ((command >> 12) & 0xf); i++) {
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error = i8042_wait_write();
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if (error)
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return error;
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dbg("%02x -> i8042 (parameter)", param[i]);
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i8042_write_data(param[i]);
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}
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for (i = 0; i < ((command >> 8) & 0xf); i++) {
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error = i8042_wait_read();
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if (error) {
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dbg(" -- i8042 (timeout)");
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return error;
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}
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if (command == I8042_CMD_AUX_LOOP &&
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!(i8042_read_status() & I8042_STR_AUXDATA)) {
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dbg(" -- i8042 (auxerr)");
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return -1;
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}
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param[i] = i8042_read_data();
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dbg("%02x <- i8042 (return)", param[i]);
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}
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return 0;
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}
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static int i8042_command(unsigned char *param, int command)
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{
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unsigned long flags;
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int retval;
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spin_lock_irqsave(&i8042_lock, flags);
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retval = __i8042_command(param, command);
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spin_unlock_irqrestore(&i8042_lock, flags);
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return retval;
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}
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/*
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* i8042_kbd_write() sends a byte out through the keyboard interface.
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*/
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static int i8042_kbd_write(struct serio *port, unsigned char c)
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{
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unsigned long flags;
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int retval = 0;
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spin_lock_irqsave(&i8042_lock, flags);
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if (!(retval = i8042_wait_write())) {
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dbg("%02x -> i8042 (kbd-data)", c);
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i8042_write_data(c);
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}
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spin_unlock_irqrestore(&i8042_lock, flags);
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return retval;
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}
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/*
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* i8042_aux_write() sends a byte out through the aux interface.
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*/
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static int i8042_aux_write(struct serio *serio, unsigned char c)
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{
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struct i8042_port *port = serio->port_data;
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return i8042_command(&c, port->mux == -1 ?
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I8042_CMD_AUX_SEND :
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I8042_CMD_MUX_SEND + port->mux);
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}
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/*
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* i8042_start() is called by serio core when port is about to finish
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* registering. It will mark port as existing so i8042_interrupt can
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* start sending data through it.
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*/
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static int i8042_start(struct serio *serio)
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{
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struct i8042_port *port = serio->port_data;
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port->exists = 1;
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mb();
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return 0;
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}
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/*
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* i8042_stop() marks serio port as non-existing so i8042_interrupt
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* will not try to send data to the port that is about to go away.
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* The function is called by serio core as part of unregister procedure.
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*/
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static void i8042_stop(struct serio *serio)
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{
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struct i8042_port *port = serio->port_data;
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port->exists = 0;
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synchronize_sched();
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port->serio = NULL;
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}
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/*
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* i8042_interrupt() is the most important function in this driver -
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* it handles the interrupts from the i8042, and sends incoming bytes
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* to the upper layers.
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*/
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static irqreturn_t i8042_interrupt(int irq, void *dev_id)
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{
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struct i8042_port *port;
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unsigned long flags;
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unsigned char str, data;
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unsigned int dfl;
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unsigned int port_no;
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int ret = 1;
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spin_lock_irqsave(&i8042_lock, flags);
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str = i8042_read_status();
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if (unlikely(~str & I8042_STR_OBF)) {
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spin_unlock_irqrestore(&i8042_lock, flags);
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if (irq) dbg("Interrupt %d, without any data", irq);
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ret = 0;
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goto out;
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}
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data = i8042_read_data();
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spin_unlock_irqrestore(&i8042_lock, flags);
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if (i8042_mux_present && (str & I8042_STR_AUXDATA)) {
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static unsigned long last_transmit;
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static unsigned char last_str;
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dfl = 0;
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if (str & I8042_STR_MUXERR) {
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dbg("MUX error, status is %02x, data is %02x", str, data);
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/*
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* When MUXERR condition is signalled the data register can only contain
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* 0xfd, 0xfe or 0xff if implementation follows the spec. Unfortunately
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* it is not always the case. Some KBCs also report 0xfc when there is
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* nothing connected to the port while others sometimes get confused which
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* port the data came from and signal error leaving the data intact. They
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* _do not_ revert to legacy mode (actually I've never seen KBC reverting
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* to legacy mode yet, when we see one we'll add proper handling).
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* Anyway, we process 0xfc, 0xfd, 0xfe and 0xff as timeouts, and for the
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* rest assume that the data came from the same serio last byte
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* was transmitted (if transmission happened not too long ago).
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*/
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switch (data) {
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default:
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if (time_before(jiffies, last_transmit + HZ/10)) {
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str = last_str;
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break;
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}
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/* fall through - report timeout */
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case 0xfc:
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case 0xfd:
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case 0xfe: dfl = SERIO_TIMEOUT; data = 0xfe; break;
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case 0xff: dfl = SERIO_PARITY; data = 0xfe; break;
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}
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}
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port_no = I8042_MUX_PORT_NO + ((str >> 6) & 3);
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last_str = str;
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last_transmit = jiffies;
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} else {
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dfl = ((str & I8042_STR_PARITY) ? SERIO_PARITY : 0) |
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((str & I8042_STR_TIMEOUT) ? SERIO_TIMEOUT : 0);
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port_no = (str & I8042_STR_AUXDATA) ?
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I8042_AUX_PORT_NO : I8042_KBD_PORT_NO;
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}
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port = &i8042_ports[port_no];
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dbg("%02x <- i8042 (interrupt, %d, %d%s%s)",
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data, port_no, irq,
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dfl & SERIO_PARITY ? ", bad parity" : "",
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dfl & SERIO_TIMEOUT ? ", timeout" : "");
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if (unlikely(i8042_suppress_kbd_ack))
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if (port_no == I8042_KBD_PORT_NO &&
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(data == 0xfa || data == 0xfe)) {
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i8042_suppress_kbd_ack--;
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goto out;
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}
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if (likely(port->exists))
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serio_interrupt(port->serio, data, dfl);
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out:
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return IRQ_RETVAL(ret);
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}
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/*
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* i8042_enable_kbd_port enables keybaord port on chip
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*/
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static int i8042_enable_kbd_port(void)
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{
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i8042_ctr &= ~I8042_CTR_KBDDIS;
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i8042_ctr |= I8042_CTR_KBDINT;
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if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
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printk(KERN_ERR "i8042.c: Failed to enable KBD port.\n");
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return -EIO;
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}
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return 0;
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}
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/*
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* i8042_enable_aux_port enables AUX (mouse) port on chip
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*/
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static int i8042_enable_aux_port(void)
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{
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i8042_ctr &= ~I8042_CTR_AUXDIS;
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i8042_ctr |= I8042_CTR_AUXINT;
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if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
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printk(KERN_ERR "i8042.c: Failed to enable AUX port.\n");
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return -EIO;
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}
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return 0;
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}
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/*
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* i8042_enable_mux_ports enables 4 individual AUX ports after
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* the controller has been switched into Multiplexed mode
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*/
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static int i8042_enable_mux_ports(void)
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{
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unsigned char param;
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int i;
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for (i = 0; i < I8042_NUM_MUX_PORTS; i++) {
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i8042_command(¶m, I8042_CMD_MUX_PFX + i);
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i8042_command(¶m, I8042_CMD_AUX_ENABLE);
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}
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return i8042_enable_aux_port();
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}
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/*
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* i8042_set_mux_mode checks whether the controller has an active
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* multiplexor and puts the chip into Multiplexed (1) or Legacy (0) mode.
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*/
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static int i8042_set_mux_mode(unsigned int mode, unsigned char *mux_version)
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{
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unsigned char param;
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/*
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* Get rid of bytes in the queue.
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*/
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i8042_flush();
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/*
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* Internal loopback test - send three bytes, they should come back from the
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* mouse interface, the last should be version.
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*/
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param = 0xf0;
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if (i8042_command(¶m, I8042_CMD_AUX_LOOP) || param != 0xf0)
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return -1;
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param = mode ? 0x56 : 0xf6;
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if (i8042_command(¶m, I8042_CMD_AUX_LOOP) || param != (mode ? 0x56 : 0xf6))
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return -1;
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param = mode ? 0xa4 : 0xa5;
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if (i8042_command(¶m, I8042_CMD_AUX_LOOP) || param == (mode ? 0xa4 : 0xa5))
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return -1;
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if (mux_version)
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*mux_version = param;
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return 0;
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}
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|
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/*
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* i8042_check_mux() checks whether the controller supports the PS/2 Active
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* Multiplexing specification by Synaptics, Phoenix, Insyde and
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* LCS/Telegraphics.
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*/
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static int __devinit i8042_check_mux(void)
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{
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unsigned char mux_version;
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if (i8042_set_mux_mode(1, &mux_version))
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return -1;
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|
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/*
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* Workaround for interference with USB Legacy emulation
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* that causes a v10.12 MUX to be found.
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*/
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if (mux_version == 0xAC)
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return -1;
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printk(KERN_INFO "i8042.c: Detected active multiplexing controller, rev %d.%d.\n",
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(mux_version >> 4) & 0xf, mux_version & 0xf);
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/*
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* Disable all muxed ports by disabling AUX.
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*/
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i8042_ctr |= I8042_CTR_AUXDIS;
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i8042_ctr &= ~I8042_CTR_AUXINT;
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if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR)) {
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printk(KERN_ERR "i8042.c: Failed to disable AUX port, can't use MUX.\n");
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return -EIO;
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}
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i8042_mux_present = 1;
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return 0;
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}
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|
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/*
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* The following is used to test AUX IRQ delivery.
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*/
|
|
static struct completion i8042_aux_irq_delivered __devinitdata;
|
|
static int i8042_irq_being_tested __devinitdata;
|
|
|
|
static irqreturn_t __devinit i8042_aux_test_irq(int irq, void *dev_id)
|
|
{
|
|
unsigned long flags;
|
|
unsigned char str, data;
|
|
|
|
spin_lock_irqsave(&i8042_lock, flags);
|
|
str = i8042_read_status();
|
|
if (str & I8042_STR_OBF) {
|
|
data = i8042_read_data();
|
|
if (i8042_irq_being_tested &&
|
|
data == 0xa5 && (str & I8042_STR_AUXDATA))
|
|
complete(&i8042_aux_irq_delivered);
|
|
}
|
|
spin_unlock_irqrestore(&i8042_lock, flags);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* i8042_toggle_aux - enables or disables AUX port on i8042 via command and
|
|
* verifies success by readinng CTR. Used when testing for presence of AUX
|
|
* port.
|
|
*/
|
|
static int __devinit i8042_toggle_aux(int on)
|
|
{
|
|
unsigned char param;
|
|
int i;
|
|
|
|
if (i8042_command(¶m,
|
|
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(¶m, I8042_CMD_CTL_RCTR))
|
|
return -1;
|
|
|
|
if (!(param & I8042_CTR_AUXDIS) == on)
|
|
return 0;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* i8042_check_aux() applies as much paranoia as it can at detecting
|
|
* the presence of an AUX interface.
|
|
*/
|
|
|
|
static int __devinit i8042_check_aux(void)
|
|
{
|
|
int retval = -1;
|
|
int irq_registered = 0;
|
|
int aux_loop_broken = 0;
|
|
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(¶m, 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(¶m, 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 = 1;
|
|
}
|
|
|
|
/*
|
|
* Bit assignment test - filters out PS/2 i8042's in AT mode
|
|
*/
|
|
|
|
if (i8042_toggle_aux(0)) {
|
|
printk(KERN_WARNING "Failed to disable AUX port, but continuing anyway... Is this a SiS?\n");
|
|
printk(KERN_WARNING "If AUX port is really absent please use the 'i8042.noaux' option.\n");
|
|
}
|
|
|
|
if (i8042_toggle_aux(1))
|
|
return -1;
|
|
|
|
/*
|
|
* 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 || 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 = 1;
|
|
|
|
if (i8042_enable_aux_port())
|
|
goto out;
|
|
|
|
spin_lock_irqsave(&i8042_lock, flags);
|
|
|
|
init_completion(&i8042_aux_irq_delivered);
|
|
i8042_irq_being_tested = 1;
|
|
|
|
param = 0xa5;
|
|
retval = __i8042_command(¶m, 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.
|
|
*/
|
|
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;
|
|
}
|
|
|
|
static int i8042_controller_check(void)
|
|
{
|
|
if (i8042_flush() == I8042_BUFFER_SIZE) {
|
|
printk(KERN_ERR "i8042.c: No controller found.\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int i8042_controller_selftest(void)
|
|
{
|
|
unsigned char param;
|
|
|
|
if (!i8042_reset)
|
|
return 0;
|
|
|
|
if (i8042_command(¶m, I8042_CMD_CTL_TEST)) {
|
|
printk(KERN_ERR "i8042.c: i8042 controller self test timeout.\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (param != I8042_RET_CTL_TEST) {
|
|
printk(KERN_ERR "i8042.c: i8042 controller selftest failed. (%#x != %#x)\n",
|
|
param, I8042_RET_CTL_TEST);
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
/*
|
|
* Save the CTR for restoral on unload / reboot.
|
|
*/
|
|
|
|
if (i8042_command(&i8042_ctr, I8042_CMD_CTL_RCTR)) {
|
|
printk(KERN_ERR "i8042.c: Can't read CTR while initializing i8042.\n");
|
|
return -EIO;
|
|
}
|
|
|
|
i8042_initial_ctr = i8042_ctr;
|
|
|
|
/*
|
|
* 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
|
|
printk(KERN_WARNING "i8042.c: 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 = 1;
|
|
|
|
/*
|
|
* 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)) {
|
|
printk(KERN_ERR "i8042.c: Can't write CTR while initializing i8042.\n");
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Reset the controller and reset CRT to the original value set by BIOS.
|
|
*/
|
|
|
|
static void i8042_controller_reset(void)
|
|
{
|
|
i8042_flush();
|
|
|
|
/*
|
|
* Disable both KBD and AUX interfaces so they don't get in the way
|
|
*/
|
|
|
|
i8042_ctr |= I8042_CTR_KBDDIS | I8042_CTR_AUXDIS;
|
|
i8042_ctr &= ~(I8042_CTR_KBDINT | I8042_CTR_AUXINT);
|
|
|
|
/*
|
|
* Disable MUX mode if present.
|
|
*/
|
|
|
|
if (i8042_mux_present)
|
|
i8042_set_mux_mode(0, NULL);
|
|
|
|
/*
|
|
* Reset the controller if requested.
|
|
*/
|
|
|
|
i8042_controller_selftest();
|
|
|
|
/*
|
|
* Restore the original control register setting.
|
|
*/
|
|
|
|
if (i8042_command(&i8042_initial_ctr, I8042_CMD_CTL_WCTR))
|
|
printk(KERN_WARNING "i8042.c: Can't restore CTR.\n");
|
|
}
|
|
|
|
|
|
/*
|
|
* i8042_panic_blink() will flash the keyboard LEDs and is called when
|
|
* kernel panics. Flashing LEDs is useful for users running X who may
|
|
* not see the console and will help distingushing 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(long count)
|
|
{
|
|
long delay = 0;
|
|
static long last_blink;
|
|
static char led;
|
|
|
|
/*
|
|
* We expect frequency to be about 1/2s. KDB uses about 1s.
|
|
* Make sure they are different.
|
|
*/
|
|
if (!i8042_blink_frequency)
|
|
return 0;
|
|
if (count - last_blink < i8042_blink_frequency)
|
|
return 0;
|
|
|
|
led ^= 0x01 | 0x04;
|
|
while (i8042_read_status() & I8042_STR_IBF)
|
|
DELAY;
|
|
dbg("%02x -> i8042 (panic blink)", 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)", led);
|
|
i8042_write_data(led);
|
|
DELAY;
|
|
last_blink = count;
|
|
return delay;
|
|
}
|
|
|
|
#undef DELAY
|
|
|
|
#ifdef CONFIG_PM
|
|
/*
|
|
* Here we try to restore the original BIOS settings. We only want to
|
|
* do that once, when we really suspend, not when we taking memory
|
|
* snapshot for swsusp (in this case we'll perform required cleanup
|
|
* as part of shutdown process).
|
|
*/
|
|
|
|
static int i8042_suspend(struct platform_device *dev, pm_message_t state)
|
|
{
|
|
if (dev->dev.power.power_state.event != state.event) {
|
|
if (state.event == PM_EVENT_SUSPEND)
|
|
i8042_controller_reset();
|
|
|
|
dev->dev.power.power_state = state;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Here we try to reset everything back to a state in which suspended
|
|
*/
|
|
|
|
static int i8042_resume(struct platform_device *dev)
|
|
{
|
|
int error;
|
|
|
|
/*
|
|
* Do not bother with restoring state if we haven't suspened yet
|
|
*/
|
|
if (dev->dev.power.power_state.event == PM_EVENT_ON)
|
|
return 0;
|
|
|
|
error = i8042_controller_check();
|
|
if (error)
|
|
return error;
|
|
|
|
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)) {
|
|
printk(KERN_ERR "i8042: Can't write CTR to resume\n");
|
|
return -EIO;
|
|
}
|
|
|
|
if (i8042_mux_present) {
|
|
if (i8042_set_mux_mode(1, NULL) || i8042_enable_mux_ports())
|
|
printk(KERN_WARNING
|
|
"i8042: 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);
|
|
|
|
dev->dev.power.power_state = PMSG_ON;
|
|
|
|
return 0;
|
|
}
|
|
#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();
|
|
}
|
|
|
|
static int __devinit 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->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));
|
|
|
|
port->serio = serio;
|
|
port->irq = I8042_KBD_IRQ;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __devinit 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->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));
|
|
} else {
|
|
snprintf(serio->name, sizeof(serio->name), "i8042 AUX%d port", idx);
|
|
snprintf(serio->phys, sizeof(serio->phys), I8042_MUX_PHYS_DESC, idx + 1);
|
|
}
|
|
|
|
port->serio = serio;
|
|
port->mux = idx;
|
|
port->irq = I8042_AUX_IRQ;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __devinit i8042_free_kbd_port(void)
|
|
{
|
|
kfree(i8042_ports[I8042_KBD_PORT_NO].serio);
|
|
i8042_ports[I8042_KBD_PORT_NO].serio = NULL;
|
|
}
|
|
|
|
static void __devinit i8042_free_aux_ports(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = I8042_AUX_PORT_NO; i < I8042_NUM_PORTS; i++) {
|
|
kfree(i8042_ports[i].serio);
|
|
i8042_ports[i].serio = NULL;
|
|
}
|
|
}
|
|
|
|
static void __devinit i8042_register_ports(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < I8042_NUM_PORTS; i++) {
|
|
if (i8042_ports[i].serio) {
|
|
printk(KERN_INFO "serio: %s at %#lx,%#lx irq %d\n",
|
|
i8042_ports[i].serio->name,
|
|
(unsigned long) I8042_DATA_REG,
|
|
(unsigned long) I8042_COMMAND_REG,
|
|
i8042_ports[i].irq);
|
|
serio_register_port(i8042_ports[i].serio);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void __devinit 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;
|
|
}
|
|
}
|
|
}
|
|
|
|
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 = 0;
|
|
}
|
|
|
|
static int __devinit 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 = 1;
|
|
return 0;
|
|
|
|
err_free_irq:
|
|
free_irq(I8042_AUX_IRQ, i8042_platform_device);
|
|
err_free_ports:
|
|
i8042_free_aux_ports();
|
|
return error;
|
|
}
|
|
|
|
static int __devinit 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 = 1;
|
|
return 0;
|
|
|
|
err_free_irq:
|
|
free_irq(I8042_KBD_IRQ, i8042_platform_device);
|
|
err_free_port:
|
|
i8042_free_kbd_port();
|
|
return error;
|
|
}
|
|
|
|
static int __devinit i8042_probe(struct platform_device *dev)
|
|
{
|
|
int error;
|
|
|
|
error = i8042_controller_selftest();
|
|
if (error)
|
|
return error;
|
|
|
|
error = i8042_controller_init();
|
|
if (error)
|
|
return error;
|
|
|
|
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();
|
|
|
|
return error;
|
|
}
|
|
|
|
static int __devexit i8042_remove(struct platform_device *dev)
|
|
{
|
|
i8042_unregister_ports();
|
|
i8042_free_irqs();
|
|
i8042_controller_reset();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver i8042_driver = {
|
|
.driver = {
|
|
.name = "i8042",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = i8042_probe,
|
|
.remove = __devexit_p(i8042_remove),
|
|
.shutdown = i8042_shutdown,
|
|
#ifdef CONFIG_PM
|
|
.suspend = i8042_suspend,
|
|
.resume = i8042_resume,
|
|
#endif
|
|
};
|
|
|
|
static int __init i8042_init(void)
|
|
{
|
|
int err;
|
|
|
|
dbg_init();
|
|
|
|
err = i8042_platform_init();
|
|
if (err)
|
|
return err;
|
|
|
|
err = i8042_controller_check();
|
|
if (err)
|
|
goto err_platform_exit;
|
|
|
|
err = platform_driver_register(&i8042_driver);
|
|
if (err)
|
|
goto err_platform_exit;
|
|
|
|
i8042_platform_device = platform_device_alloc("i8042", -1);
|
|
if (!i8042_platform_device) {
|
|
err = -ENOMEM;
|
|
goto err_unregister_driver;
|
|
}
|
|
|
|
err = platform_device_add(i8042_platform_device);
|
|
if (err)
|
|
goto err_free_device;
|
|
|
|
panic_blink = i8042_panic_blink;
|
|
|
|
return 0;
|
|
|
|
err_free_device:
|
|
platform_device_put(i8042_platform_device);
|
|
err_unregister_driver:
|
|
platform_driver_unregister(&i8042_driver);
|
|
err_platform_exit:
|
|
i8042_platform_exit();
|
|
|
|
return err;
|
|
}
|
|
|
|
static void __exit i8042_exit(void)
|
|
{
|
|
platform_device_unregister(i8042_platform_device);
|
|
platform_driver_unregister(&i8042_driver);
|
|
i8042_platform_exit();
|
|
|
|
panic_blink = NULL;
|
|
}
|
|
|
|
module_init(i8042_init);
|
|
module_exit(i8042_exit);
|