mirror of https://gitee.com/openkylin/linux.git
463 lines
11 KiB
C
463 lines
11 KiB
C
/*
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* drivers/input/serio/gscps2.c
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*
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* Copyright (c) 2004-2006 Helge Deller <deller@gmx.de>
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* Copyright (c) 2002 Laurent Canet <canetl@esiee.fr>
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* Copyright (c) 2002 Thibaut Varene <varenet@parisc-linux.org>
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*
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* Pieces of code based on linux-2.4's hp_mouse.c & hp_keyb.c
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* Copyright (c) 1999 Alex deVries <alex@onefishtwo.ca>
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* Copyright (c) 1999-2000 Philipp Rumpf <prumpf@tux.org>
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* Copyright (c) 2000 Xavier Debacker <debackex@esiee.fr>
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* Copyright (c) 2000-2001 Thomas Marteau <marteaut@esiee.fr>
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*
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* HP GSC PS/2 port driver, found in PA/RISC Workstations
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* TODO:
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* - Dino testing (did HP ever shipped a machine on which this port
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* was usable/enabled ?)
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/serio.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/spinlock.h>
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#include <linux/delay.h>
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#include <linux/ioport.h>
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#include <asm/irq.h>
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#include <asm/io.h>
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#include <asm/parisc-device.h>
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MODULE_AUTHOR("Laurent Canet <canetl@esiee.fr>, Thibaut Varene <varenet@parisc-linux.org>, Helge Deller <deller@gmx.de>");
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MODULE_DESCRIPTION("HP GSC PS2 port driver");
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MODULE_LICENSE("GPL");
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#define PFX "gscps2.c: "
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/*
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* Driver constants
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*/
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/* various constants */
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#define ENABLE 1
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#define DISABLE 0
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#define GSC_DINO_OFFSET 0x0800 /* offset for DINO controller versus LASI one */
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/* PS/2 IO port offsets */
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#define GSC_ID 0x00 /* device ID offset (see: GSC_ID_XXX) */
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#define GSC_RESET 0x00 /* reset port offset */
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#define GSC_RCVDATA 0x04 /* receive port offset */
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#define GSC_XMTDATA 0x04 /* transmit port offset */
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#define GSC_CONTROL 0x08 /* see: Control register bits */
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#define GSC_STATUS 0x0C /* see: Status register bits */
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/* Control register bits */
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#define GSC_CTRL_ENBL 0x01 /* enable interface */
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#define GSC_CTRL_LPBXR 0x02 /* loopback operation */
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#define GSC_CTRL_DIAG 0x20 /* directly control clock/data line */
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#define GSC_CTRL_DATDIR 0x40 /* data line direct control */
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#define GSC_CTRL_CLKDIR 0x80 /* clock line direct control */
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/* Status register bits */
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#define GSC_STAT_RBNE 0x01 /* Receive Buffer Not Empty */
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#define GSC_STAT_TBNE 0x02 /* Transmit Buffer Not Empty */
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#define GSC_STAT_TERR 0x04 /* Timeout Error */
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#define GSC_STAT_PERR 0x08 /* Parity Error */
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#define GSC_STAT_CMPINTR 0x10 /* Composite Interrupt = irq on any port */
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#define GSC_STAT_DATSHD 0x40 /* Data Line Shadow */
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#define GSC_STAT_CLKSHD 0x80 /* Clock Line Shadow */
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/* IDs returned by GSC_ID port register */
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#define GSC_ID_KEYBOARD 0 /* device ID values */
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#define GSC_ID_MOUSE 1
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static irqreturn_t gscps2_interrupt(int irq, void *dev);
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#define BUFFER_SIZE 0x0f
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/* GSC PS/2 port device struct */
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struct gscps2port {
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struct list_head node;
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struct parisc_device *padev;
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struct serio *port;
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spinlock_t lock;
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char __iomem *addr;
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u8 act, append; /* position in buffer[] */
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struct {
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u8 data;
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u8 str;
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} buffer[BUFFER_SIZE+1];
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int id;
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};
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/*
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* Various HW level routines
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*/
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#define gscps2_readb_input(x) readb((x)+GSC_RCVDATA)
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#define gscps2_readb_control(x) readb((x)+GSC_CONTROL)
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#define gscps2_readb_status(x) readb((x)+GSC_STATUS)
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#define gscps2_writeb_control(x, y) writeb((x), (y)+GSC_CONTROL)
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/*
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* wait_TBE() - wait for Transmit Buffer Empty
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*/
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static int wait_TBE(char __iomem *addr)
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{
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int timeout = 25000; /* device is expected to react within 250 msec */
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while (gscps2_readb_status(addr) & GSC_STAT_TBNE) {
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if (!--timeout)
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return 0; /* This should not happen */
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udelay(10);
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}
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return 1;
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}
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/*
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* gscps2_flush() - flush the receive buffer
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*/
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static void gscps2_flush(struct gscps2port *ps2port)
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{
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while (gscps2_readb_status(ps2port->addr) & GSC_STAT_RBNE)
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gscps2_readb_input(ps2port->addr);
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ps2port->act = ps2port->append = 0;
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}
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/*
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* gscps2_writeb_output() - write a byte to the port
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*
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* returns 1 on success, 0 on error
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*/
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static inline int gscps2_writeb_output(struct gscps2port *ps2port, u8 data)
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{
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unsigned long flags;
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char __iomem *addr = ps2port->addr;
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if (!wait_TBE(addr)) {
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printk(KERN_DEBUG PFX "timeout - could not write byte %#x\n", data);
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return 0;
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}
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while (gscps2_readb_status(addr) & GSC_STAT_RBNE)
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/* wait */;
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spin_lock_irqsave(&ps2port->lock, flags);
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writeb(data, addr+GSC_XMTDATA);
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spin_unlock_irqrestore(&ps2port->lock, flags);
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/* this is ugly, but due to timing of the port it seems to be necessary. */
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mdelay(6);
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/* make sure any received data is returned as fast as possible */
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/* this is important e.g. when we set the LEDs on the keyboard */
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gscps2_interrupt(0, NULL);
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return 1;
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}
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/*
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* gscps2_enable() - enables or disables the port
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*/
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static void gscps2_enable(struct gscps2port *ps2port, int enable)
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{
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unsigned long flags;
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u8 data;
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/* now enable/disable the port */
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spin_lock_irqsave(&ps2port->lock, flags);
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gscps2_flush(ps2port);
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data = gscps2_readb_control(ps2port->addr);
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if (enable)
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data |= GSC_CTRL_ENBL;
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else
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data &= ~GSC_CTRL_ENBL;
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gscps2_writeb_control(data, ps2port->addr);
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spin_unlock_irqrestore(&ps2port->lock, flags);
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wait_TBE(ps2port->addr);
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gscps2_flush(ps2port);
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}
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/*
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* gscps2_reset() - resets the PS/2 port
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*/
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static void gscps2_reset(struct gscps2port *ps2port)
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{
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unsigned long flags;
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/* reset the interface */
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spin_lock_irqsave(&ps2port->lock, flags);
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gscps2_flush(ps2port);
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writeb(0xff, ps2port->addr + GSC_RESET);
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gscps2_flush(ps2port);
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spin_unlock_irqrestore(&ps2port->lock, flags);
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}
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static LIST_HEAD(ps2port_list);
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/**
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* gscps2_interrupt() - Interruption service routine
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*
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* This function reads received PS/2 bytes and processes them on
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* all interfaces.
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* The problematic part here is, that the keyboard and mouse PS/2 port
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* share the same interrupt and it's not possible to send data if any
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* one of them holds input data. To solve this problem we try to receive
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* the data as fast as possible and handle the reporting to the upper layer
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* later.
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*/
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static irqreturn_t gscps2_interrupt(int irq, void *dev)
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{
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struct gscps2port *ps2port;
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list_for_each_entry(ps2port, &ps2port_list, node) {
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unsigned long flags;
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spin_lock_irqsave(&ps2port->lock, flags);
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while ( (ps2port->buffer[ps2port->append].str =
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gscps2_readb_status(ps2port->addr)) & GSC_STAT_RBNE ) {
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ps2port->buffer[ps2port->append].data =
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gscps2_readb_input(ps2port->addr);
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ps2port->append = ((ps2port->append+1) & BUFFER_SIZE);
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}
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spin_unlock_irqrestore(&ps2port->lock, flags);
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} /* list_for_each_entry */
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/* all data was read from the ports - now report the data to upper layer */
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list_for_each_entry(ps2port, &ps2port_list, node) {
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while (ps2port->act != ps2port->append) {
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unsigned int rxflags;
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u8 data, status;
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/* Did new data arrived while we read existing data ?
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If yes, exit now and let the new irq handler start over again */
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if (gscps2_readb_status(ps2port->addr) & GSC_STAT_CMPINTR)
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return IRQ_HANDLED;
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status = ps2port->buffer[ps2port->act].str;
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data = ps2port->buffer[ps2port->act].data;
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ps2port->act = ((ps2port->act+1) & BUFFER_SIZE);
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rxflags = ((status & GSC_STAT_TERR) ? SERIO_TIMEOUT : 0 ) |
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((status & GSC_STAT_PERR) ? SERIO_PARITY : 0 );
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serio_interrupt(ps2port->port, data, rxflags);
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} /* while() */
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} /* list_for_each_entry */
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return IRQ_HANDLED;
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}
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/*
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* gscps2_write() - send a byte out through the aux interface.
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*/
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static int gscps2_write(struct serio *port, unsigned char data)
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{
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struct gscps2port *ps2port = port->port_data;
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if (!gscps2_writeb_output(ps2port, data)) {
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printk(KERN_DEBUG PFX "sending byte %#x failed.\n", data);
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return -1;
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}
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return 0;
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}
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/*
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* gscps2_open() is called when a port is opened by the higher layer.
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* It resets and enables the port.
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*/
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static int gscps2_open(struct serio *port)
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{
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struct gscps2port *ps2port = port->port_data;
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gscps2_reset(ps2port);
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/* enable it */
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gscps2_enable(ps2port, ENABLE);
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gscps2_interrupt(0, NULL);
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return 0;
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}
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/*
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* gscps2_close() disables the port
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*/
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static void gscps2_close(struct serio *port)
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{
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struct gscps2port *ps2port = port->port_data;
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gscps2_enable(ps2port, DISABLE);
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}
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/**
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* gscps2_probe() - Probes PS2 devices
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* @return: success/error report
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*/
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static int __init gscps2_probe(struct parisc_device *dev)
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{
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struct gscps2port *ps2port;
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struct serio *serio;
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unsigned long hpa = dev->hpa.start;
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int ret;
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if (!dev->irq)
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return -ENODEV;
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/* Offset for DINO PS/2. Works with LASI even */
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if (dev->id.sversion == 0x96)
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hpa += GSC_DINO_OFFSET;
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ps2port = kzalloc(sizeof(struct gscps2port), GFP_KERNEL);
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serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
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if (!ps2port || !serio) {
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ret = -ENOMEM;
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goto fail_nomem;
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}
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dev_set_drvdata(&dev->dev, ps2port);
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ps2port->port = serio;
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ps2port->padev = dev;
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ps2port->addr = ioremap(hpa, GSC_STATUS + 4);
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spin_lock_init(&ps2port->lock);
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gscps2_reset(ps2port);
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ps2port->id = readb(ps2port->addr + GSC_ID) & 0x0f;
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snprintf(serio->name, sizeof(serio->name), "gsc-ps2-%s",
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(ps2port->id == GSC_ID_KEYBOARD) ? "keyboard" : "mouse");
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strlcpy(serio->phys, dev_name(&dev->dev), sizeof(serio->phys));
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serio->id.type = SERIO_8042;
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serio->write = gscps2_write;
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serio->open = gscps2_open;
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serio->close = gscps2_close;
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serio->port_data = ps2port;
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serio->dev.parent = &dev->dev;
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ret = -EBUSY;
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if (request_irq(dev->irq, gscps2_interrupt, IRQF_SHARED, ps2port->port->name, ps2port))
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goto fail_miserably;
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if (ps2port->id != GSC_ID_KEYBOARD && ps2port->id != GSC_ID_MOUSE) {
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printk(KERN_WARNING PFX "Unsupported PS/2 port at 0x%08lx (id=%d) ignored\n",
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hpa, ps2port->id);
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ret = -ENODEV;
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goto fail;
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}
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#if 0
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if (!request_mem_region(hpa, GSC_STATUS + 4, ps2port->port.name))
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goto fail;
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#endif
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pr_info("serio: %s port at 0x%08lx irq %d @ %s\n",
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ps2port->port->name,
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hpa,
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ps2port->padev->irq,
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ps2port->port->phys);
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serio_register_port(ps2port->port);
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list_add_tail(&ps2port->node, &ps2port_list);
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return 0;
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fail:
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free_irq(dev->irq, ps2port);
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fail_miserably:
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iounmap(ps2port->addr);
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release_mem_region(dev->hpa.start, GSC_STATUS + 4);
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fail_nomem:
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kfree(ps2port);
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kfree(serio);
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return ret;
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}
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/**
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* gscps2_remove() - Removes PS2 devices
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* @return: success/error report
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*/
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static int __exit gscps2_remove(struct parisc_device *dev)
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{
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struct gscps2port *ps2port = dev_get_drvdata(&dev->dev);
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serio_unregister_port(ps2port->port);
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free_irq(dev->irq, ps2port);
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gscps2_flush(ps2port);
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list_del(&ps2port->node);
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iounmap(ps2port->addr);
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#if 0
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release_mem_region(dev->hpa, GSC_STATUS + 4);
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#endif
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dev_set_drvdata(&dev->dev, NULL);
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kfree(ps2port);
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return 0;
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}
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static const struct parisc_device_id gscps2_device_tbl[] __initconst = {
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{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00084 }, /* LASI PS/2 */
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#ifdef DINO_TESTED
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{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00096 }, /* DINO PS/2 */
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#endif
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{ 0, } /* 0 terminated list */
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};
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MODULE_DEVICE_TABLE(parisc, gscps2_device_tbl);
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static struct parisc_driver parisc_ps2_driver __refdata = {
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.name = "gsc_ps2",
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.id_table = gscps2_device_tbl,
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.probe = gscps2_probe,
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.remove = __exit_p(gscps2_remove),
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};
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static int __init gscps2_init(void)
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{
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register_parisc_driver(&parisc_ps2_driver);
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return 0;
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}
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static void __exit gscps2_exit(void)
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{
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unregister_parisc_driver(&parisc_ps2_driver);
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}
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module_init(gscps2_init);
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module_exit(gscps2_exit);
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