[net-next-2.6.git] / drivers / input / serio / sa1111ps2.c

/*
 *  linux/drivers/input/serio/sa1111ps2.c
 *
 *  Copyright (C) 2002 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License.
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>

#include <asm/io.h>
#include <asm/system.h>

#include <asm/hardware/sa1111.h>

struct ps2if {
	struct serio		*io;
	struct sa1111_dev	*dev;
	void __iomem		*base;
	unsigned int		open;
	spinlock_t		lock;
	unsigned int		head;
	unsigned int		tail;
	unsigned char		buf[4];
};

/*
 * Read all bytes waiting in the PS2 port.  There should be
 * at the most one, but we loop for safety.  If there was a
 * framing error, we have to manually clear the status.
 */
static irqreturn_t ps2_rxint(int irq, void *dev_id)
{
	struct ps2if *ps2if = dev_id;
	unsigned int scancode, flag, status;

	status = sa1111_readl(ps2if->base + SA1111_PS2STAT);
	while (status & PS2STAT_RXF) {
		if (status & PS2STAT_STP)
			sa1111_writel(PS2STAT_STP, ps2if->base + SA1111_PS2STAT);

		flag = (status & PS2STAT_STP ? SERIO_FRAME : 0) |
		       (status & PS2STAT_RXP ? 0 : SERIO_PARITY);

		scancode = sa1111_readl(ps2if->base + SA1111_PS2DATA) & 0xff;

		if (hweight8(scancode) & 1)
			flag ^= SERIO_PARITY;

		serio_interrupt(ps2if->io, scancode, flag);

		status = sa1111_readl(ps2if->base + SA1111_PS2STAT);
        }

        return IRQ_HANDLED;
}

/*
 * Completion of ps2 write
 */
static irqreturn_t ps2_txint(int irq, void *dev_id)
{
	struct ps2if *ps2if = dev_id;
	unsigned int status;

	spin_lock(&ps2if->lock);
	status = sa1111_readl(ps2if->base + SA1111_PS2STAT);
	if (ps2if->head == ps2if->tail) {
		disable_irq(irq);
		/* done */
	} else if (status & PS2STAT_TXE) {
		sa1111_writel(ps2if->buf[ps2if->tail], ps2if->base + SA1111_PS2DATA);
		ps2if->tail = (ps2if->tail + 1) & (sizeof(ps2if->buf) - 1);
	}
	spin_unlock(&ps2if->lock);

	return IRQ_HANDLED;
}

/*
 * Write a byte to the PS2 port.  We have to wait for the
 * port to indicate that the transmitter is empty.
 */
static int ps2_write(struct serio *io, unsigned char val)
{
	struct ps2if *ps2if = io->port_data;
	unsigned long flags;
	unsigned int head;

	spin_lock_irqsave(&ps2if->lock, flags);

	/*
	 * If the TX register is empty, we can go straight out.
	 */
	if (sa1111_readl(ps2if->base + SA1111_PS2STAT) & PS2STAT_TXE) {
		sa1111_writel(val, ps2if->base + SA1111_PS2DATA);
	} else {
		if (ps2if->head == ps2if->tail)
			enable_irq(ps2if->dev->irq[1]);
		head = (ps2if->head + 1) & (sizeof(ps2if->buf) - 1);
		if (head != ps2if->tail) {
			ps2if->buf[ps2if->head] = val;
			ps2if->head = head;
		}
	}

	spin_unlock_irqrestore(&ps2if->lock, flags);
	return 0;
}

static int ps2_open(struct serio *io)
{
	struct ps2if *ps2if = io->port_data;
	int ret;

	sa1111_enable_device(ps2if->dev);

	ret = request_irq(ps2if->dev->irq[0], ps2_rxint, 0,
			  SA1111_DRIVER_NAME(ps2if->dev), ps2if);
	if (ret) {
		printk(KERN_ERR "sa1111ps2: could not allocate IRQ%d: %d\n",
			ps2if->dev->irq[0], ret);
		return ret;
	}

	ret = request_irq(ps2if->dev->irq[1], ps2_txint, 0,
			  SA1111_DRIVER_NAME(ps2if->dev), ps2if);
	if (ret) {
		printk(KERN_ERR "sa1111ps2: could not allocate IRQ%d: %d\n",
			ps2if->dev->irq[1], ret);
		free_irq(ps2if->dev->irq[0], ps2if);
		return ret;
	}

	ps2if->open = 1;

	enable_irq_wake(ps2if->dev->irq[0]);

	sa1111_writel(PS2CR_ENA, ps2if->base + SA1111_PS2CR);
	return 0;
}

static void ps2_close(struct serio *io)
{
	struct ps2if *ps2if = io->port_data;

	sa1111_writel(0, ps2if->base + SA1111_PS2CR);

	disable_irq_wake(ps2if->dev->irq[0]);

	ps2if->open = 0;

	free_irq(ps2if->dev->irq[1], ps2if);
	free_irq(ps2if->dev->irq[0], ps2if);

	sa1111_disable_device(ps2if->dev);
}

/*
 * Clear the input buffer.
 */
static void __init ps2_clear_input(struct ps2if *ps2if)
{
	int maxread = 100;

	while (maxread--) {
		if ((sa1111_readl(ps2if->base + SA1111_PS2DATA) & 0xff) == 0xff)
			break;
	}
}

static inline unsigned int
ps2_test_one(struct ps2if *ps2if, unsigned int mask)
{
	unsigned int val;

	sa1111_writel(PS2CR_ENA | mask, ps2if->base + SA1111_PS2CR);

	udelay(2);

	val = sa1111_readl(ps2if->base + SA1111_PS2STAT);
	return val & (PS2STAT_KBC | PS2STAT_KBD);
}

/*
 * Test the keyboard interface.  We basically check to make sure that
 * we can drive each line to the keyboard independently of each other.
 */
static int __init ps2_test(struct ps2if *ps2if)
{
	unsigned int stat;
	int ret = 0;

	stat = ps2_test_one(ps2if, PS2CR_FKC);
	if (stat != PS2STAT_KBD) {
		printk("PS/2 interface test failed[1]: %02x\n", stat);
		ret = -ENODEV;
	}

	stat = ps2_test_one(ps2if, 0);
	if (stat != (PS2STAT_KBC | PS2STAT_KBD)) {
		printk("PS/2 interface test failed[2]: %02x\n", stat);
		ret = -ENODEV;
	}

	stat = ps2_test_one(ps2if, PS2CR_FKD);
	if (stat != PS2STAT_KBC) {
		printk("PS/2 interface test failed[3]: %02x\n", stat);
		ret = -ENODEV;
	}

	sa1111_writel(0, ps2if->base + SA1111_PS2CR);

	return ret;
}

/*
 * Add one device to this driver.
 */
static int ps2_probe(struct sa1111_dev *dev)
{
	struct ps2if *ps2if;
	struct serio *serio;
	int ret;

	ps2if = kmalloc(sizeof(struct ps2if), GFP_KERNEL);
	serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
	if (!ps2if || !serio) {
		ret = -ENOMEM;
		goto free;
	}

	memset(ps2if, 0, sizeof(struct ps2if));
	memset(serio, 0, sizeof(struct serio));

	serio->id.type		= SERIO_8042;
	serio->write		= ps2_write;
	serio->open		= ps2_open;
	serio->close		= ps2_close;
	strlcpy(serio->name, dev->dev.bus_id, sizeof(serio->name));
	strlcpy(serio->phys, dev->dev.bus_id, sizeof(serio->phys));
	serio->port_data	= ps2if;
	serio->dev.parent	= &dev->dev;
	ps2if->io		= serio;
	ps2if->dev		= dev;
	sa1111_set_drvdata(dev, ps2if);

	spin_lock_init(&ps2if->lock);

	/*
	 * Request the physical region for this PS2 port.
	 */
	if (!request_mem_region(dev->res.start,
				dev->res.end - dev->res.start + 1,
				SA1111_DRIVER_NAME(dev))) {
		ret = -EBUSY;
		goto free;
	}

	/*
	 * Our parent device has already mapped the region.
	 */
	ps2if->base = dev->mapbase;

	sa1111_enable_device(ps2if->dev);

	/* Incoming clock is 8MHz */
	sa1111_writel(0, ps2if->base + SA1111_PS2CLKDIV);
	sa1111_writel(127, ps2if->base + SA1111_PS2PRECNT);

	/*
	 * Flush any pending input.
	 */
	ps2_clear_input(ps2if);

	/*
	 * Test the keyboard interface.
	 */
	ret = ps2_test(ps2if);
	if (ret)
		goto out;

	/*
	 * Flush any pending input.
	 */
	ps2_clear_input(ps2if);

	sa1111_disable_device(ps2if->dev);
	serio_register_port(ps2if->io);
	return 0;

 out:
	sa1111_disable_device(ps2if->dev);
	release_mem_region(dev->res.start,
			   dev->res.end - dev->res.start + 1);
 free:
	sa1111_set_drvdata(dev, NULL);
	kfree(ps2if);
	kfree(serio);
	return ret;
}

/*
 * Remove one device from this driver.
 */
static int ps2_remove(struct sa1111_dev *dev)
{
	struct ps2if *ps2if = sa1111_get_drvdata(dev);

	serio_unregister_port(ps2if->io);
	release_mem_region(dev->res.start,
			   dev->res.end - dev->res.start + 1);
	sa1111_set_drvdata(dev, NULL);

	kfree(ps2if);

	return 0;
}

/*
 * Our device driver structure
 */
static struct sa1111_driver ps2_driver = {
	.drv = {
		.name	= "sa1111-ps2",
	},
	.devid		= SA1111_DEVID_PS2,
	.probe		= ps2_probe,
	.remove		= ps2_remove,
};

static int __init ps2_init(void)
{
	return sa1111_driver_register(&ps2_driver);
}

static void __exit ps2_exit(void)
{
	sa1111_driver_unregister(&ps2_driver);
}

module_init(ps2_init);
module_exit(ps2_exit);

MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
MODULE_DESCRIPTION("SA1111 PS2 controller driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/drivers/input/serio/sa1111ps2.c
	3	*
	4	* Copyright (C) 2002 Russell King
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License.
	9	*/
	10	#include <linux/module.h>
	11	#include <linux/init.h>
	12	#include <linux/input.h>
	13	#include <linux/serio.h>
	14	#include <linux/errno.h>
	15	#include <linux/interrupt.h>
	16	#include <linux/ioport.h>
	17	#include <linux/delay.h>
	18	#include <linux/device.h>
	19	#include <linux/slab.h>
	20	#include <linux/spinlock.h>
	21
	22	#include <asm/io.h>
1da177e4 LT	23	#include <asm/system.h>
	24
	25	#include <asm/hardware/sa1111.h>
	26
	27	struct ps2if {
	28	struct serio *io;
	29	struct sa1111_dev *dev;
	30	void __iomem *base;
	31	unsigned int open;
	32	spinlock_t lock;
	33	unsigned int head;
	34	unsigned int tail;
	35	unsigned char buf[4];
	36	};
	37
	38	/*
	39	* Read all bytes waiting in the PS2 port. There should be
	40	* at the most one, but we loop for safety. If there was a
	41	* framing error, we have to manually clear the status.
	42	*/
7d12e780	43	static irqreturn_t ps2_rxint(int irq, void *dev_id)
1da177e4 LT	44	{
	45	struct ps2if *ps2if = dev_id;
	46	unsigned int scancode, flag, status;
	47
	48	status = sa1111_readl(ps2if->base + SA1111_PS2STAT);
	49	while (status & PS2STAT_RXF) {
	50	if (status & PS2STAT_STP)
	51	sa1111_writel(PS2STAT_STP, ps2if->base + SA1111_PS2STAT);
	52
	53	flag = (status & PS2STAT_STP ? SERIO_FRAME : 0) \|
	54	(status & PS2STAT_RXP ? 0 : SERIO_PARITY);
	55
	56	scancode = sa1111_readl(ps2if->base + SA1111_PS2DATA) & 0xff;
	57
	58	if (hweight8(scancode) & 1)
	59	flag ^= SERIO_PARITY;
	60
7d12e780	61	serio_interrupt(ps2if->io, scancode, flag);
1da177e4 LT	62
	63	status = sa1111_readl(ps2if->base + SA1111_PS2STAT);
	64	}
	65
	66	return IRQ_HANDLED;
	67	}
	68
	69	/*
	70	* Completion of ps2 write
	71	*/
7d12e780	72	static irqreturn_t ps2_txint(int irq, void *dev_id)
1da177e4 LT	73	{
	74	struct ps2if *ps2if = dev_id;
	75	unsigned int status;
	76
	77	spin_lock(&ps2if->lock);
	78	status = sa1111_readl(ps2if->base + SA1111_PS2STAT);
	79	if (ps2if->head == ps2if->tail) {
	80	disable_irq(irq);
	81	/* done */
	82	} else if (status & PS2STAT_TXE) {
	83	sa1111_writel(ps2if->buf[ps2if->tail], ps2if->base + SA1111_PS2DATA);
	84	ps2if->tail = (ps2if->tail + 1) & (sizeof(ps2if->buf) - 1);
	85	}
	86	spin_unlock(&ps2if->lock);
	87
	88	return IRQ_HANDLED;
	89	}
	90
	91	/*
	92	* Write a byte to the PS2 port. We have to wait for the
	93	* port to indicate that the transmitter is empty.
	94	*/
	95	static int ps2_write(struct serio *io, unsigned char val)
	96	{
	97	struct ps2if *ps2if = io->port_data;
	98	unsigned long flags;
	99	unsigned int head;
	100
	101	spin_lock_irqsave(&ps2if->lock, flags);
	102
	103	/*
	104	* If the TX register is empty, we can go straight out.
	105	*/
	106	if (sa1111_readl(ps2if->base + SA1111_PS2STAT) & PS2STAT_TXE) {
	107	sa1111_writel(val, ps2if->base + SA1111_PS2DATA);
	108	} else {
	109	if (ps2if->head == ps2if->tail)
	110	enable_irq(ps2if->dev->irq[1]);
	111	head = (ps2if->head + 1) & (sizeof(ps2if->buf) - 1);
	112	if (head != ps2if->tail) {
	113	ps2if->buf[ps2if->head] = val;
	114	ps2if->head = head;
	115	}
	116	}
	117
	118	spin_unlock_irqrestore(&ps2if->lock, flags);
	119	return 0;
	120	}
	121
	122	static int ps2_open(struct serio *io)
	123	{
	124	struct ps2if *ps2if = io->port_data;
	125	int ret;
	126
	127	sa1111_enable_device(ps2if->dev);
	128
	129	ret = request_irq(ps2if->dev->irq[0], ps2_rxint, 0,
	130	SA1111_DRIVER_NAME(ps2if->dev), ps2if);
	131	if (ret) {
	132	printk(KERN_ERR "sa1111ps2: could not allocate IRQ%d: %d\n",
	133	ps2if->dev->irq[0], ret);
	134	return ret;
	135	}
	136
137	ret = request_irq(ps2if->dev->irq[1], ps2_txint, 0,
138	SA1111_DRIVER_NAME(ps2if->dev), ps2if);
139	if (ret) {
140	printk(KERN_ERR "sa1111ps2: could not allocate IRQ%d: %d\n",
141	ps2if->dev->irq[1], ret);
142	free_irq(ps2if->dev->irq[0], ps2if);
143	return ret;
144	}
145
146	ps2if->open = 1;
147
148	enable_irq_wake(ps2if->dev->irq[0]);
149
150	sa1111_writel(PS2CR_ENA, ps2if->base + SA1111_PS2CR);
151	return 0;
152	}
153
154	static void ps2_close(struct serio *io)
155	{
156	struct ps2if *ps2if = io->port_data;
157
158	sa1111_writel(0, ps2if->base + SA1111_PS2CR);
159
160	disable_irq_wake(ps2if->dev->irq[0]);
161
162	ps2if->open = 0;
163
164	free_irq(ps2if->dev->irq[1], ps2if);
165	free_irq(ps2if->dev->irq[0], ps2if);
166
167	sa1111_disable_device(ps2if->dev);
168	}
169
170	/*
171	* Clear the input buffer.
172	*/
173	static void __init ps2_clear_input(struct ps2if *ps2if)
174	{
175	int maxread = 100;
176
177	while (maxread--) {
178	if ((sa1111_readl(ps2if->base + SA1111_PS2DATA) & 0xff) == 0xff)
179	break;
180	}
181	}
182
183	static inline unsigned int
184	ps2_test_one(struct ps2if *ps2if, unsigned int mask)
185	{
186	unsigned int val;
187
188	sa1111_writel(PS2CR_ENA \| mask, ps2if->base + SA1111_PS2CR);
189
190	udelay(2);
191
192	val = sa1111_readl(ps2if->base + SA1111_PS2STAT);
193	return val & (PS2STAT_KBC \| PS2STAT_KBD);
194	}
195
196	/*
197	* Test the keyboard interface. We basically check to make sure that
198	* we can drive each line to the keyboard independently of each other.
199	*/
200	static int __init ps2_test(struct ps2if *ps2if)
201	{
202	unsigned int stat;
203	int ret = 0;
204
205	stat = ps2_test_one(ps2if, PS2CR_FKC);
206	if (stat != PS2STAT_KBD) {
207	printk("PS/2 interface test failed[1]: %02x\n", stat);
208	ret = -ENODEV;
209	}
210
211	stat = ps2_test_one(ps2if, 0);
212	if (stat != (PS2STAT_KBC \| PS2STAT_KBD)) {
213	printk("PS/2 interface test failed[2]: %02x\n", stat);
214	ret = -ENODEV;
215	}
216
217	stat = ps2_test_one(ps2if, PS2CR_FKD);
218	if (stat != PS2STAT_KBC) {
219	printk("PS/2 interface test failed[3]: %02x\n", stat);
220	ret = -ENODEV;
221	}
222
223	sa1111_writel(0, ps2if->base + SA1111_PS2CR);
224
225	return ret;
226	}
227
228	/*
229	* Add one device to this driver.
230	*/
231	static int ps2_probe(struct sa1111_dev *dev)
232	{
233	struct ps2if *ps2if;
234	struct serio *serio;
235	int ret;
236
237	ps2if = kmalloc(sizeof(struct ps2if), GFP_KERNEL);
238	serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
239	if (!ps2if \|\| !serio) {
240	ret = -ENOMEM;
241	goto free;
242	}
243
244	memset(ps2if, 0, sizeof(struct ps2if));
245	memset(serio, 0, sizeof(struct serio));
246
247	serio->id.type = SERIO_8042;
248	serio->write = ps2_write;
249	serio->open = ps2_open;
250	serio->close = ps2_close;
251	strlcpy(serio->name, dev->dev.bus_id, sizeof(serio->name));
252	strlcpy(serio->phys, dev->dev.bus_id, sizeof(serio->phys));
253	serio->port_data = ps2if;
254	serio->dev.parent = &dev->dev;
255	ps2if->io = serio;
256	ps2if->dev = dev;
257	sa1111_set_drvdata(dev, ps2if);
258
259	spin_lock_init(&ps2if->lock);
260
261	/*
262	* Request the physical region for this PS2 port.
263	*/
264	if (!request_mem_region(dev->res.start,
265	dev->res.end - dev->res.start + 1,
266	SA1111_DRIVER_NAME(dev))) {
267	ret = -EBUSY;
268	goto free;
269	}
270
271	/*
272	* Our parent device has already mapped the region.
273	*/
274	ps2if->base = dev->mapbase;
275
276	sa1111_enable_device(ps2if->dev);
277
278	/* Incoming clock is 8MHz */
279	sa1111_writel(0, ps2if->base + SA1111_PS2CLKDIV);
280	sa1111_writel(127, ps2if->base + SA1111_PS2PRECNT);
281
282	/*
283	* Flush any pending input.
284	*/
285	ps2_clear_input(ps2if);
286
287	/*
288	* Test the keyboard interface.
289	*/
290	ret = ps2_test(ps2if);
291	if (ret)
292	goto out;
293
294	/*
295	* Flush any pending input.
296	*/
297	ps2_clear_input(ps2if);
298
299	sa1111_disable_device(ps2if->dev);
300	serio_register_port(ps2if->io);
301	return 0;
302
303	out:
304	sa1111_disable_device(ps2if->dev);
305	release_mem_region(dev->res.start,
306	dev->res.end - dev->res.start + 1);
307	free:
308	sa1111_set_drvdata(dev, NULL);
309	kfree(ps2if);
310	kfree(serio);
311	return ret;
312	}
313
314	/*
315	* Remove one device from this driver.
316	*/
317	static int ps2_remove(struct sa1111_dev *dev)
318	{
319	struct ps2if *ps2if = sa1111_get_drvdata(dev);
320
321	serio_unregister_port(ps2if->io);
322	release_mem_region(dev->res.start,
323	dev->res.end - dev->res.start + 1);
324	sa1111_set_drvdata(dev, NULL);
325
326	kfree(ps2if);
327
328	return 0;
329	}
330
331	/*
332	* Our device driver structure
333	*/
334	static struct sa1111_driver ps2_driver = {
335	.drv = {
336	.name = "sa1111-ps2",
337	},
338	.devid = SA1111_DEVID_PS2,
339	.probe = ps2_probe,
340	.remove = ps2_remove,
341	};
342
343	static int __init ps2_init(void)
344	{
345	return sa1111_driver_register(&ps2_driver);
346	}
347
348	static void __exit ps2_exit(void)
349	{
350	sa1111_driver_unregister(&ps2_driver);
351	}
352
353	module_init(ps2_init);
354	module_exit(ps2_exit);
355
356	MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
357	MODULE_DESCRIPTION("SA1111 PS2 controller driver");
358	MODULE_LICENSE("GPL");