2 * drivers/input/serio/gscps2.c
4 * Copyright (c) 2004 Helge Deller <deller@gmx.de>
5 * Copyright (c) 2002 Laurent Canet <canetl@esiee.fr>
6 * Copyright (c) 2002 Thibaut Varene <varenet@parisc-linux.org>
8 * Pieces of code based on linux-2.4's hp_mouse.c & hp_keyb.c
9 * Copyright (c) 1999 Alex deVries <alex@onefishtwo.ca>
10 * Copyright (c) 1999-2000 Philipp Rumpf <prumpf@tux.org>
11 * Copyright (c) 2000 Xavier Debacker <debackex@esiee.fr>
12 * Copyright (c) 2000-2001 Thomas Marteau <marteaut@esiee.fr>
14 * HP GSC PS/2 port driver, found in PA/RISC Workstations
16 * This file is subject to the terms and conditions of the GNU General Public
17 * License. See the file "COPYING" in the main directory of this archive
21 * - Dino testing (did HP ever shipped a machine on which this port
22 * was usable/enabled ?)
25 #include <linux/config.h>
26 #include <linux/init.h>
27 #include <linux/module.h>
28 #include <linux/serio.h>
29 #include <linux/input.h>
30 #include <linux/interrupt.h>
31 #include <linux/spinlock.h>
32 #include <linux/delay.h>
33 #include <linux/ioport.h>
34 #include <linux/pci_ids.h>
38 #include <asm/parisc-device.h>
40 MODULE_AUTHOR("Laurent Canet <canetl@esiee.fr>, Thibaut Varene <varenet@parisc-linux.org>, Helge Deller <deller@gmx.de>");
41 MODULE_DESCRIPTION("HP GSC PS2 port driver");
42 MODULE_LICENSE("GPL");
43 MODULE_DEVICE_TABLE(parisc, gscps2_device_tbl);
45 #define PFX "gscps2.c: "
51 /* various constants */
55 #define GSC_DINO_OFFSET 0x0800 /* offset for DINO controller versus LASI one */
57 /* PS/2 IO port offsets */
58 #define GSC_ID 0x00 /* device ID offset (see: GSC_ID_XXX) */
59 #define GSC_RESET 0x00 /* reset port offset */
60 #define GSC_RCVDATA 0x04 /* receive port offset */
61 #define GSC_XMTDATA 0x04 /* transmit port offset */
62 #define GSC_CONTROL 0x08 /* see: Control register bits */
63 #define GSC_STATUS 0x0C /* see: Status register bits */
65 /* Control register bits */
66 #define GSC_CTRL_ENBL 0x01 /* enable interface */
67 #define GSC_CTRL_LPBXR 0x02 /* loopback operation */
68 #define GSC_CTRL_DIAG 0x20 /* directly control clock/data line */
69 #define GSC_CTRL_DATDIR 0x40 /* data line direct control */
70 #define GSC_CTRL_CLKDIR 0x80 /* clock line direct control */
72 /* Status register bits */
73 #define GSC_STAT_RBNE 0x01 /* Receive Buffer Not Empty */
74 #define GSC_STAT_TBNE 0x02 /* Transmit Buffer Not Empty */
75 #define GSC_STAT_TERR 0x04 /* Timeout Error */
76 #define GSC_STAT_PERR 0x08 /* Parity Error */
77 #define GSC_STAT_CMPINTR 0x10 /* Composite Interrupt = irq on any port */
78 #define GSC_STAT_DATSHD 0x40 /* Data Line Shadow */
79 #define GSC_STAT_CLKSHD 0x80 /* Clock Line Shadow */
81 /* IDs returned by GSC_ID port register */
82 #define GSC_ID_KEYBOARD 0 /* device ID values */
83 #define GSC_ID_MOUSE 1
86 static irqreturn_t gscps2_interrupt(int irq, void *dev, struct pt_regs *regs);
88 #define BUFFER_SIZE 0x0f
90 /* GSC PS/2 port device struct */
92 struct list_head node;
93 struct parisc_device *padev;
97 u8 act, append; /* position in buffer[] */
101 } buffer[BUFFER_SIZE+1];
106 * Various HW level routines
109 #define gscps2_readb_input(x) readb((x)+GSC_RCVDATA)
110 #define gscps2_readb_control(x) readb((x)+GSC_CONTROL)
111 #define gscps2_readb_status(x) readb((x)+GSC_STATUS)
112 #define gscps2_writeb_control(x, y) writeb((x), (y)+GSC_CONTROL)
116 * wait_TBE() - wait for Transmit Buffer Empty
119 static int wait_TBE(char *addr)
121 int timeout = 25000; /* device is expected to react within 250 msec */
122 while (gscps2_readb_status(addr) & GSC_STAT_TBNE) {
124 return 0; /* This should not happen */
132 * gscps2_flush() - flush the receive buffer
135 static void gscps2_flush(struct gscps2port *ps2port)
137 while (gscps2_readb_status(ps2port->addr) & GSC_STAT_RBNE)
138 gscps2_readb_input(ps2port->addr);
139 ps2port->act = ps2port->append = 0;
143 * gscps2_writeb_output() - write a byte to the port
145 * returns 1 on sucess, 0 on error
148 static inline int gscps2_writeb_output(struct gscps2port *ps2port, u8 data)
151 char *addr = ps2port->addr;
153 if (!wait_TBE(addr)) {
154 printk(KERN_DEBUG PFX "timeout - could not write byte %#x\n", data);
158 while (gscps2_readb_status(ps2port->addr) & GSC_STAT_RBNE)
161 spin_lock_irqsave(&ps2port->lock, flags);
162 writeb(data, addr+GSC_XMTDATA);
163 spin_unlock_irqrestore(&ps2port->lock, flags);
165 /* this is ugly, but due to timing of the port it seems to be necessary. */
168 /* make sure any received data is returned as fast as possible */
169 /* this is important e.g. when we set the LEDs on the keyboard */
170 gscps2_interrupt(0, NULL, NULL);
177 * gscps2_enable() - enables or disables the port
180 static void gscps2_enable(struct gscps2port *ps2port, int enable)
185 /* now enable/disable the port */
186 spin_lock_irqsave(&ps2port->lock, flags);
187 gscps2_flush(ps2port);
188 data = gscps2_readb_control(ps2port->addr);
190 data |= GSC_CTRL_ENBL;
192 data &= ~GSC_CTRL_ENBL;
193 gscps2_writeb_control(data, ps2port->addr);
194 spin_unlock_irqrestore(&ps2port->lock, flags);
195 wait_TBE(ps2port->addr);
196 gscps2_flush(ps2port);
200 * gscps2_reset() - resets the PS/2 port
203 static void gscps2_reset(struct gscps2port *ps2port)
205 char *addr = ps2port->addr;
208 /* reset the interface */
209 spin_lock_irqsave(&ps2port->lock, flags);
210 gscps2_flush(ps2port);
211 writeb(0xff, addr+GSC_RESET);
212 gscps2_flush(ps2port);
213 spin_unlock_irqrestore(&ps2port->lock, flags);
216 static LIST_HEAD(ps2port_list);
219 * gscps2_interrupt() - Interruption service routine
221 * This function reads received PS/2 bytes and processes them on
223 * The problematic part here is, that the keyboard and mouse PS/2 port
224 * share the same interrupt and it's not possible to send data if any
225 * one of them holds input data. To solve this problem we try to receive
226 * the data as fast as possible and handle the reporting to the upper layer
230 static irqreturn_t gscps2_interrupt(int irq, void *dev, struct pt_regs *regs)
232 struct gscps2port *ps2port;
234 list_for_each_entry(ps2port, &ps2port_list, node) {
237 spin_lock_irqsave(&ps2port->lock, flags);
239 while ( (ps2port->buffer[ps2port->append].str =
240 gscps2_readb_status(ps2port->addr)) & GSC_STAT_RBNE ) {
241 ps2port->buffer[ps2port->append].data =
242 gscps2_readb_input(ps2port->addr);
243 ps2port->append = ((ps2port->append+1) & BUFFER_SIZE);
246 spin_unlock_irqrestore(&ps2port->lock, flags);
248 } /* list_for_each_entry */
250 /* all data was read from the ports - now report the data to upper layer */
252 list_for_each_entry(ps2port, &ps2port_list, node) {
254 while (ps2port->act != ps2port->append) {
256 unsigned int rxflags;
259 /* Did new data arrived while we read existing data ?
260 If yes, exit now and let the new irq handler start over again */
261 if (gscps2_readb_status(ps2port->addr) & GSC_STAT_CMPINTR)
264 status = ps2port->buffer[ps2port->act].str;
265 data = ps2port->buffer[ps2port->act].data;
267 ps2port->act = ((ps2port->act+1) & BUFFER_SIZE);
268 rxflags = ((status & GSC_STAT_TERR) ? SERIO_TIMEOUT : 0 ) |
269 ((status & GSC_STAT_PERR) ? SERIO_PARITY : 0 );
271 serio_interrupt(ps2port->port, data, rxflags, regs);
275 } /* list_for_each_entry */
282 * gscps2_write() - send a byte out through the aux interface.
285 static int gscps2_write(struct serio *port, unsigned char data)
287 struct gscps2port *ps2port = port->port_data;
289 if (!gscps2_writeb_output(ps2port, data)) {
290 printk(KERN_DEBUG PFX "sending byte %#x failed.\n", data);
297 * gscps2_open() is called when a port is opened by the higher layer.
298 * It resets and enables the port.
301 static int gscps2_open(struct serio *port)
303 struct gscps2port *ps2port = port->port_data;
305 gscps2_reset(ps2port);
308 gscps2_enable(ps2port, ENABLE);
310 gscps2_interrupt(0, NULL, NULL);
316 * gscps2_close() disables the port
319 static void gscps2_close(struct serio *port)
321 struct gscps2port *ps2port = port->port_data;
322 gscps2_enable(ps2port, DISABLE);
326 * gscps2_probe() - Probes PS2 devices
327 * @return: success/error report
330 static int __init gscps2_probe(struct parisc_device *dev)
332 struct gscps2port *ps2port;
334 unsigned long hpa = dev->hpa.start;
340 /* Offset for DINO PS/2. Works with LASI even */
341 if (dev->id.sversion == 0x96)
342 hpa += GSC_DINO_OFFSET;
344 ps2port = kmalloc(sizeof(struct gscps2port), GFP_KERNEL);
345 serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
346 if (!ps2port || !serio) {
351 dev_set_drvdata(&dev->dev, ps2port);
353 memset(ps2port, 0, sizeof(struct gscps2port));
354 memset(serio, 0, sizeof(struct serio));
355 ps2port->port = serio;
356 ps2port->padev = dev;
357 ps2port->addr = ioremap(hpa, GSC_STATUS + 4);
358 spin_lock_init(&ps2port->lock);
360 gscps2_reset(ps2port);
361 ps2port->id = readb(ps2port->addr + GSC_ID) & 0x0f;
363 snprintf(serio->name, sizeof(serio->name), "GSC PS/2 %s",
364 (ps2port->id == GSC_ID_KEYBOARD) ? "keyboard" : "mouse");
365 strlcpy(serio->phys, dev->dev.bus_id, sizeof(serio->phys));
366 serio->id.type = SERIO_8042;
367 serio->write = gscps2_write;
368 serio->open = gscps2_open;
369 serio->close = gscps2_close;
370 serio->port_data = ps2port;
371 serio->dev.parent = &dev->dev;
374 if (request_irq(dev->irq, gscps2_interrupt, SA_SHIRQ, ps2port->port->name, ps2port))
377 if (ps2port->id != GSC_ID_KEYBOARD && ps2port->id != GSC_ID_MOUSE) {
378 printk(KERN_WARNING PFX "Unsupported PS/2 port at 0x%08lx (id=%d) ignored\n",
385 if (!request_mem_region(hpa, GSC_STATUS + 4, ps2port->port.name))
389 printk(KERN_INFO "serio: %s port at 0x%p irq %d @ %s\n",
393 ps2port->port->phys);
395 serio_register_port(ps2port->port);
397 list_add_tail(&ps2port->node, &ps2port_list);
402 free_irq(dev->irq, ps2port);
405 iounmap(ps2port->addr);
406 release_mem_region(dev->hpa.start, GSC_STATUS + 4);
415 * gscps2_remove() - Removes PS2 devices
416 * @return: success/error report
419 static int __devexit gscps2_remove(struct parisc_device *dev)
421 struct gscps2port *ps2port = dev_get_drvdata(&dev->dev);
423 serio_unregister_port(ps2port->port);
424 free_irq(dev->irq, ps2port);
425 gscps2_flush(ps2port);
426 list_del(&ps2port->node);
427 iounmap(ps2port->addr);
429 release_mem_region(dev->hpa, GSC_STATUS + 4);
431 dev_set_drvdata(&dev->dev, NULL);
437 static struct parisc_device_id gscps2_device_tbl[] = {
438 { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00084 }, /* LASI PS/2 */
440 { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00096 }, /* DINO PS/2 */
442 { 0, } /* 0 terminated list */
445 static struct parisc_driver parisc_ps2_driver = {
447 .id_table = gscps2_device_tbl,
448 .probe = gscps2_probe,
449 .remove = gscps2_remove,
452 static int __init gscps2_init(void)
454 register_parisc_driver(&parisc_ps2_driver);
458 static void __exit gscps2_exit(void)
460 unregister_parisc_driver(&parisc_ps2_driver);
464 module_init(gscps2_init);
465 module_exit(gscps2_exit);