4  * Copyright (c) 2004-2006 Helge Deller <deller@gmx.de>
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
10  *	Copyright (c) 1999-2000 Philipp Rumpf <prumpf@tux.org>
12  *	Copyright (c) 2000-2001 Thomas Marteau <marteaut@esiee.fr>
21  * - Dino testing (did HP ever shipped a machine on which this port
37 #include <asm/parisc-device.h>
39 MODULE_AUTHOR("Laurent Canet <canetl@esiee.fr>, Thibaut Varene <varenet@parisc-linux.org>, Helge De…
53 #define GSC_DINO_OFFSET		0x0800	/* offset for DINO controller versus LASI one */
56 #define GSC_ID			0x00	/* device ID offset (see: GSC_ID_XXX) */
57 #define GSC_RESET		0x00	/* reset port offset */
58 #define GSC_RCVDATA		0x04	/* receive port offset */
59 #define GSC_XMTDATA		0x04	/* transmit port offset */
71 #define GSC_STAT_RBNE		0x01	/* Receive Buffer Not Empty */
72 #define GSC_STAT_TBNE		0x02	/* Transmit Buffer Not Empty */
95 	u8 act, append; /* position in buffer[] */
99 	} buffer[BUFFER_SIZE+1];  member
114  * wait_TBE() - wait for Transmit Buffer Empty
121 		if (!--timeout)  in wait_TBE()
130  * gscps2_flush() - flush the receive buffer
135 	while (gscps2_readb_status(ps2port->addr) & GSC_STAT_RBNE)  in gscps2_flush()
136 		gscps2_readb_input(ps2port->addr);  in gscps2_flush()
137 	ps2port->act = ps2port->append = 0;  in gscps2_flush()
141  * gscps2_writeb_output() - write a byte to the port
149 	char __iomem *addr = ps2port->addr;  in gscps2_writeb_output()
152 		printk(KERN_DEBUG PFX "timeout - could not write byte %#x\n", data);  in gscps2_writeb_output()
159 	spin_lock_irqsave(&ps2port->lock, flags);  in gscps2_writeb_output()
161 	spin_unlock_irqrestore(&ps2port->lock, flags);  in gscps2_writeb_output()
175  * gscps2_enable() - enables or disables the port
184 	spin_lock_irqsave(&ps2port->lock, flags);  in gscps2_enable()
186 	data = gscps2_readb_control(ps2port->addr);  in gscps2_enable()
191 	gscps2_writeb_control(data, ps2port->addr);  in gscps2_enable()
192 	spin_unlock_irqrestore(&ps2port->lock, flags);  in gscps2_enable()
193 	wait_TBE(ps2port->addr);  in gscps2_enable()
198  * gscps2_reset() - resets the PS/2 port
206 	spin_lock_irqsave(&ps2port->lock, flags);  in gscps2_reset()
208 	writeb(0xff, ps2port->addr + GSC_RESET);  in gscps2_reset()
210 	spin_unlock_irqrestore(&ps2port->lock, flags);  in gscps2_reset()
216  * gscps2_interrupt() - Interruption service routine
223  * the data as fast as possible and handle the reporting to the upper layer
234 	  spin_lock_irqsave(&ps2port->lock, flags);  in gscps2_interrupt()
236 	  while ( (ps2port->buffer[ps2port->append].str =  in gscps2_interrupt()
237 		   gscps2_readb_status(ps2port->addr)) & GSC_STAT_RBNE ) {  in gscps2_interrupt()
238 		ps2port->buffer[ps2port->append].data =  in gscps2_interrupt()
239 				gscps2_readb_input(ps2port->addr);  in gscps2_interrupt()
240 		ps2port->append = ((ps2port->append+1) & BUFFER_SIZE);  in gscps2_interrupt()
243 	  spin_unlock_irqrestore(&ps2port->lock, flags);  in gscps2_interrupt()
247 	/* all data was read from the ports - now report the data to upper layer */  in gscps2_interrupt()
251 	  while (ps2port->act != ps2port->append) {  in gscps2_interrupt()
258 	    if (gscps2_readb_status(ps2port->addr) & GSC_STAT_CMPINTR)  in gscps2_interrupt()
261 	    status = ps2port->buffer[ps2port->act].str;  in gscps2_interrupt()
262 	    data   = ps2port->buffer[ps2port->act].data;  in gscps2_interrupt()
264 	    ps2port->act = ((ps2port->act+1) & BUFFER_SIZE);  in gscps2_interrupt()
268 	    serio_interrupt(ps2port->port, data, rxflags);  in gscps2_interrupt()
279  * gscps2_write() - send a byte out through the aux interface.
284 	struct gscps2port *ps2port = port->port_data;  in gscps2_write()
288 		return -1;  in gscps2_write()
294  * gscps2_open() is called when a port is opened by the higher layer.
300 	struct gscps2port *ps2port = port->port_data;  in gscps2_open()
318 	struct gscps2port *ps2port = port->port_data;  in gscps2_close()
323  * gscps2_probe() - Probes PS2 devices
331 	unsigned long hpa = dev->hpa.start;  in gscps2_probe()
334 	if (!dev->irq)  in gscps2_probe()
335 		return -ENODEV;  in gscps2_probe()
337 	/* Offset for DINO PS/2. Works with LASI even */  in gscps2_probe()
338 	if (dev->id.sversion == 0x96)  in gscps2_probe()
344 		ret = -ENOMEM;  in gscps2_probe()
348 	dev_set_drvdata(&dev->dev, ps2port);  in gscps2_probe()
350 	ps2port->port = serio;  in gscps2_probe()
351 	ps2port->padev = dev;  in gscps2_probe()
352 	ps2port->addr = ioremap(hpa, GSC_STATUS + 4);  in gscps2_probe()
353 	if (!ps2port->addr) {  in gscps2_probe()
354 		ret = -ENOMEM;  in gscps2_probe()
357 	spin_lock_init(&ps2port->lock);  in gscps2_probe()
360 	ps2port->id = readb(ps2port->addr + GSC_ID) & 0x0f;  in gscps2_probe()
362 	snprintf(serio->name, sizeof(serio->name), "gsc-ps2-%s",  in gscps2_probe()
363 		 (ps2port->id == GSC_ID_KEYBOARD) ? "keyboard" : "mouse");  in gscps2_probe()
364 	strscpy(serio->phys, dev_name(&dev->dev), sizeof(serio->phys));  in gscps2_probe()
365 	serio->id.type		= SERIO_8042;  in gscps2_probe()
366 	serio->write		= gscps2_write;  in gscps2_probe()
367 	serio->open		= gscps2_open;  in gscps2_probe()
368 	serio->close		= gscps2_close;  in gscps2_probe()
369 	serio->port_data	= ps2port;  in gscps2_probe()
370 	serio->dev.parent	= &dev->dev;  in gscps2_probe()
372 	ret = -EBUSY;  in gscps2_probe()
373 	if (request_irq(dev->irq, gscps2_interrupt, IRQF_SHARED, ps2port->port->name, ps2port))  in gscps2_probe()
376 	if (ps2port->id != GSC_ID_KEYBOARD && ps2port->id != GSC_ID_MOUSE) {  in gscps2_probe()
378 				hpa, ps2port->id);  in gscps2_probe()
379 		ret = -ENODEV;  in gscps2_probe()
384 	if (!request_mem_region(hpa, GSC_STATUS + 4, ps2port->port.name))  in gscps2_probe()
389 		ps2port->port->name,  in gscps2_probe()
391 		ps2port->padev->irq,  in gscps2_probe()
392 		ps2port->port->phys);  in gscps2_probe()
394 	serio_register_port(ps2port->port);  in gscps2_probe()
396 	list_add_tail(&ps2port->node, &ps2port_list);  in gscps2_probe()
401 	free_irq(dev->irq, ps2port);  in gscps2_probe()
404 	iounmap(ps2port->addr);  in gscps2_probe()
405 	release_mem_region(dev->hpa.start, GSC_STATUS + 4);  in gscps2_probe()
414  * gscps2_remove() - Removes PS2 devices
420 	struct gscps2port *ps2port = dev_get_drvdata(&dev->dev);  in gscps2_remove()
422 	serio_unregister_port(ps2port->port);  in gscps2_remove()
423 	free_irq(dev->irq, ps2port);  in gscps2_remove()
425 	list_del(&ps2port->node);  in gscps2_remove()
426 	iounmap(ps2port->addr);  in gscps2_remove()
428 	release_mem_region(dev->hpa, GSC_STATUS + 4);  in gscps2_remove()
430 	dev_set_drvdata(&dev->dev, NULL);  in gscps2_remove()