diff options
Diffstat (limited to 'drivers/input/serio/gscps2.c')
| -rw-r--r-- | drivers/input/serio/gscps2.c | 466 |
1 files changed, 466 insertions, 0 deletions
diff --git a/drivers/input/serio/gscps2.c b/drivers/input/serio/gscps2.c new file mode 100644 index 000000000..70ea03a35 --- /dev/null +++ b/drivers/input/serio/gscps2.c @@ -0,0 +1,466 @@ +/* + * drivers/input/serio/gscps2.c + * + * Copyright (c) 2004-2006 Helge Deller <deller@gmx.de> + * Copyright (c) 2002 Laurent Canet <canetl@esiee.fr> + * Copyright (c) 2002 Thibaut Varene <varenet@parisc-linux.org> + * + * Pieces of code based on linux-2.4's hp_mouse.c & hp_keyb.c + * Copyright (c) 1999 Alex deVries <alex@onefishtwo.ca> + * Copyright (c) 1999-2000 Philipp Rumpf <prumpf@tux.org> + * Copyright (c) 2000 Xavier Debacker <debackex@esiee.fr> + * Copyright (c) 2000-2001 Thomas Marteau <marteaut@esiee.fr> + * + * HP GSC PS/2 port driver, found in PA/RISC Workstations + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * TODO: + * - Dino testing (did HP ever shipped a machine on which this port + * was usable/enabled ?) + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/serio.h> +#include <linux/input.h> +#include <linux/interrupt.h> +#include <linux/spinlock.h> +#include <linux/delay.h> +#include <linux/ioport.h> + +#include <asm/irq.h> +#include <asm/io.h> +#include <asm/parisc-device.h> + +MODULE_AUTHOR("Laurent Canet <canetl@esiee.fr>, Thibaut Varene <varenet@parisc-linux.org>, Helge Deller <deller@gmx.de>"); +MODULE_DESCRIPTION("HP GSC PS2 port driver"); +MODULE_LICENSE("GPL"); + +#define PFX "gscps2.c: " + +/* + * Driver constants + */ + +/* various constants */ +#define ENABLE 1 +#define DISABLE 0 + +#define GSC_DINO_OFFSET 0x0800 /* offset for DINO controller versus LASI one */ + +/* PS/2 IO port offsets */ +#define GSC_ID 0x00 /* device ID offset (see: GSC_ID_XXX) */ +#define GSC_RESET 0x00 /* reset port offset */ +#define GSC_RCVDATA 0x04 /* receive port offset */ +#define GSC_XMTDATA 0x04 /* transmit port offset */ +#define GSC_CONTROL 0x08 /* see: Control register bits */ +#define GSC_STATUS 0x0C /* see: Status register bits */ + +/* Control register bits */ +#define GSC_CTRL_ENBL 0x01 /* enable interface */ +#define GSC_CTRL_LPBXR 0x02 /* loopback operation */ +#define GSC_CTRL_DIAG 0x20 /* directly control clock/data line */ +#define GSC_CTRL_DATDIR 0x40 /* data line direct control */ +#define GSC_CTRL_CLKDIR 0x80 /* clock line direct control */ + +/* Status register bits */ +#define GSC_STAT_RBNE 0x01 /* Receive Buffer Not Empty */ +#define GSC_STAT_TBNE 0x02 /* Transmit Buffer Not Empty */ +#define GSC_STAT_TERR 0x04 /* Timeout Error */ +#define GSC_STAT_PERR 0x08 /* Parity Error */ +#define GSC_STAT_CMPINTR 0x10 /* Composite Interrupt = irq on any port */ +#define GSC_STAT_DATSHD 0x40 /* Data Line Shadow */ +#define GSC_STAT_CLKSHD 0x80 /* Clock Line Shadow */ + +/* IDs returned by GSC_ID port register */ +#define GSC_ID_KEYBOARD 0 /* device ID values */ +#define GSC_ID_MOUSE 1 + + +static irqreturn_t gscps2_interrupt(int irq, void *dev); + +#define BUFFER_SIZE 0x0f + +/* GSC PS/2 port device struct */ +struct gscps2port { + struct list_head node; + struct parisc_device *padev; + struct serio *port; + spinlock_t lock; + char __iomem *addr; + u8 act, append; /* position in buffer[] */ + struct { + u8 data; + u8 str; + } buffer[BUFFER_SIZE+1]; + int id; +}; + +/* + * Various HW level routines + */ + +#define gscps2_readb_input(x) readb((x)+GSC_RCVDATA) +#define gscps2_readb_control(x) readb((x)+GSC_CONTROL) +#define gscps2_readb_status(x) readb((x)+GSC_STATUS) +#define gscps2_writeb_control(x, y) writeb((x), (y)+GSC_CONTROL) + + +/* + * wait_TBE() - wait for Transmit Buffer Empty + */ + +static int wait_TBE(char __iomem *addr) +{ + int timeout = 25000; /* device is expected to react within 250 msec */ + while (gscps2_readb_status(addr) & GSC_STAT_TBNE) { + if (!--timeout) + return 0; /* This should not happen */ + udelay(10); + } + return 1; +} + + +/* + * gscps2_flush() - flush the receive buffer + */ + +static void gscps2_flush(struct gscps2port *ps2port) +{ + while (gscps2_readb_status(ps2port->addr) & GSC_STAT_RBNE) + gscps2_readb_input(ps2port->addr); + ps2port->act = ps2port->append = 0; +} + +/* + * gscps2_writeb_output() - write a byte to the port + * + * returns 1 on success, 0 on error + */ + +static inline int gscps2_writeb_output(struct gscps2port *ps2port, u8 data) +{ + unsigned long flags; + char __iomem *addr = ps2port->addr; + + if (!wait_TBE(addr)) { + printk(KERN_DEBUG PFX "timeout - could not write byte %#x\n", data); + return 0; + } + + while (gscps2_readb_status(addr) & GSC_STAT_RBNE) + /* wait */; + + spin_lock_irqsave(&ps2port->lock, flags); + writeb(data, addr+GSC_XMTDATA); + spin_unlock_irqrestore(&ps2port->lock, flags); + + /* this is ugly, but due to timing of the port it seems to be necessary. */ + mdelay(6); + + /* make sure any received data is returned as fast as possible */ + /* this is important e.g. when we set the LEDs on the keyboard */ + gscps2_interrupt(0, NULL); + + return 1; +} + + +/* + * gscps2_enable() - enables or disables the port + */ + +static void gscps2_enable(struct gscps2port *ps2port, int enable) +{ + unsigned long flags; + u8 data; + + /* now enable/disable the port */ + spin_lock_irqsave(&ps2port->lock, flags); + gscps2_flush(ps2port); + data = gscps2_readb_control(ps2port->addr); + if (enable) + data |= GSC_CTRL_ENBL; + else + data &= ~GSC_CTRL_ENBL; + gscps2_writeb_control(data, ps2port->addr); + spin_unlock_irqrestore(&ps2port->lock, flags); + wait_TBE(ps2port->addr); + gscps2_flush(ps2port); +} + +/* + * gscps2_reset() - resets the PS/2 port + */ + +static void gscps2_reset(struct gscps2port *ps2port) +{ + unsigned long flags; + + /* reset the interface */ + spin_lock_irqsave(&ps2port->lock, flags); + gscps2_flush(ps2port); + writeb(0xff, ps2port->addr + GSC_RESET); + gscps2_flush(ps2port); + spin_unlock_irqrestore(&ps2port->lock, flags); +} + +static LIST_HEAD(ps2port_list); + +/** + * gscps2_interrupt() - Interruption service routine + * + * This function reads received PS/2 bytes and processes them on + * all interfaces. + * The problematic part here is, that the keyboard and mouse PS/2 port + * share the same interrupt and it's not possible to send data if any + * one of them holds input data. To solve this problem we try to receive + * the data as fast as possible and handle the reporting to the upper layer + * later. + */ + +static irqreturn_t gscps2_interrupt(int irq, void *dev) +{ + struct gscps2port *ps2port; + + list_for_each_entry(ps2port, &ps2port_list, node) { + + unsigned long flags; + spin_lock_irqsave(&ps2port->lock, flags); + + while ( (ps2port->buffer[ps2port->append].str = + gscps2_readb_status(ps2port->addr)) & GSC_STAT_RBNE ) { + ps2port->buffer[ps2port->append].data = + gscps2_readb_input(ps2port->addr); + ps2port->append = ((ps2port->append+1) & BUFFER_SIZE); + } + + spin_unlock_irqrestore(&ps2port->lock, flags); + + } /* list_for_each_entry */ + + /* all data was read from the ports - now report the data to upper layer */ + + list_for_each_entry(ps2port, &ps2port_list, node) { + + while (ps2port->act != ps2port->append) { + + unsigned int rxflags; + u8 data, status; + + /* Did new data arrived while we read existing data ? + If yes, exit now and let the new irq handler start over again */ + if (gscps2_readb_status(ps2port->addr) & GSC_STAT_CMPINTR) + return IRQ_HANDLED; + + status = ps2port->buffer[ps2port->act].str; + data = ps2port->buffer[ps2port->act].data; + + ps2port->act = ((ps2port->act+1) & BUFFER_SIZE); + rxflags = ((status & GSC_STAT_TERR) ? SERIO_TIMEOUT : 0 ) | + ((status & GSC_STAT_PERR) ? SERIO_PARITY : 0 ); + + serio_interrupt(ps2port->port, data, rxflags); + + } /* while() */ + + } /* list_for_each_entry */ + + return IRQ_HANDLED; +} + + +/* + * gscps2_write() - send a byte out through the aux interface. + */ + +static int gscps2_write(struct serio *port, unsigned char data) +{ + struct gscps2port *ps2port = port->port_data; + + if (!gscps2_writeb_output(ps2port, data)) { + printk(KERN_DEBUG PFX "sending byte %#x failed.\n", data); + return -1; + } + return 0; +} + +/* + * gscps2_open() is called when a port is opened by the higher layer. + * It resets and enables the port. + */ + +static int gscps2_open(struct serio *port) +{ + struct gscps2port *ps2port = port->port_data; + + gscps2_reset(ps2port); + + /* enable it */ + gscps2_enable(ps2port, ENABLE); + + gscps2_interrupt(0, NULL); + + return 0; +} + +/* + * gscps2_close() disables the port + */ + +static void gscps2_close(struct serio *port) +{ + struct gscps2port *ps2port = port->port_data; + gscps2_enable(ps2port, DISABLE); +} + +/** + * gscps2_probe() - Probes PS2 devices + * @return: success/error report + */ + +static int __init gscps2_probe(struct parisc_device *dev) +{ + struct gscps2port *ps2port; + struct serio *serio; + unsigned long hpa = dev->hpa.start; + int ret; + + if (!dev->irq) + return -ENODEV; + + /* Offset for DINO PS/2. Works with LASI even */ + if (dev->id.sversion == 0x96) + hpa += GSC_DINO_OFFSET; + + ps2port = kzalloc(sizeof(struct gscps2port), GFP_KERNEL); + serio = kzalloc(sizeof(struct serio), GFP_KERNEL); + if (!ps2port || !serio) { + ret = -ENOMEM; + goto fail_nomem; + } + + dev_set_drvdata(&dev->dev, ps2port); + + ps2port->port = serio; + ps2port->padev = dev; + ps2port->addr = ioremap(hpa, GSC_STATUS + 4); + if (!ps2port->addr) { + ret = -ENOMEM; + goto fail_nomem; + } + spin_lock_init(&ps2port->lock); + + gscps2_reset(ps2port); + ps2port->id = readb(ps2port->addr + GSC_ID) & 0x0f; + + snprintf(serio->name, sizeof(serio->name), "gsc-ps2-%s", + (ps2port->id == GSC_ID_KEYBOARD) ? "keyboard" : "mouse"); + strlcpy(serio->phys, dev_name(&dev->dev), sizeof(serio->phys)); + serio->id.type = SERIO_8042; + serio->write = gscps2_write; + serio->open = gscps2_open; + serio->close = gscps2_close; + serio->port_data = ps2port; + serio->dev.parent = &dev->dev; + + ret = -EBUSY; + if (request_irq(dev->irq, gscps2_interrupt, IRQF_SHARED, ps2port->port->name, ps2port)) + goto fail_miserably; + + if (ps2port->id != GSC_ID_KEYBOARD && ps2port->id != GSC_ID_MOUSE) { + printk(KERN_WARNING PFX "Unsupported PS/2 port at 0x%08lx (id=%d) ignored\n", + hpa, ps2port->id); + ret = -ENODEV; + goto fail; + } + +#if 0 + if (!request_mem_region(hpa, GSC_STATUS + 4, ps2port->port.name)) + goto fail; +#endif + + pr_info("serio: %s port at 0x%08lx irq %d @ %s\n", + ps2port->port->name, + hpa, + ps2port->padev->irq, + ps2port->port->phys); + + serio_register_port(ps2port->port); + + list_add_tail(&ps2port->node, &ps2port_list); + + return 0; + +fail: + free_irq(dev->irq, ps2port); + +fail_miserably: + iounmap(ps2port->addr); + release_mem_region(dev->hpa.start, GSC_STATUS + 4); + +fail_nomem: + kfree(ps2port); + kfree(serio); + return ret; +} + +/** + * gscps2_remove() - Removes PS2 devices + * @return: success/error report + */ + +static int __exit gscps2_remove(struct parisc_device *dev) +{ + struct gscps2port *ps2port = dev_get_drvdata(&dev->dev); + + serio_unregister_port(ps2port->port); + free_irq(dev->irq, ps2port); + gscps2_flush(ps2port); + list_del(&ps2port->node); + iounmap(ps2port->addr); +#if 0 + release_mem_region(dev->hpa, GSC_STATUS + 4); +#endif + dev_set_drvdata(&dev->dev, NULL); + kfree(ps2port); + return 0; +} + + +static const struct parisc_device_id gscps2_device_tbl[] __initconst = { + { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00084 }, /* LASI PS/2 */ +#ifdef DINO_TESTED + { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00096 }, /* DINO PS/2 */ +#endif + { 0, } /* 0 terminated list */ +}; +MODULE_DEVICE_TABLE(parisc, gscps2_device_tbl); + +static struct parisc_driver parisc_ps2_driver __refdata = { + .name = "gsc_ps2", + .id_table = gscps2_device_tbl, + .probe = gscps2_probe, + .remove = __exit_p(gscps2_remove), +}; + +static int __init gscps2_init(void) +{ + register_parisc_driver(&parisc_ps2_driver); + return 0; +} + +static void __exit gscps2_exit(void) +{ + unregister_parisc_driver(&parisc_ps2_driver); +} + + +module_init(gscps2_init); +module_exit(gscps2_exit); + |