[deliverable/linux.git] / drivers / input / misc / ixp4xx-beeper.c

/*
 * Generic IXP4xx beeper driver
 *
 * Copyright (C) 2005 Tower Technologies
 *
 * based on nslu2-io.c
 *  Copyright (C) 2004 Karen Spearel
 *
 * Author: Alessandro Zummo <a.zummo@towertech.it>
 * Maintainers: http://www.nslu2-linux.org/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/module.h>
#include <linux/input.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <mach/hardware.h>

MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
MODULE_DESCRIPTION("ixp4xx beeper driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:ixp4xx-beeper");

static DEFINE_SPINLOCK(beep_lock);

static void ixp4xx_spkr_control(unsigned int pin, unsigned int count)
{
	unsigned long flags;

	spin_lock_irqsave(&beep_lock, flags);

	if (count) {
		gpio_direction_output(pin, 0);
		*IXP4XX_OSRT2 = (count & ~IXP4XX_OST_RELOAD_MASK) | IXP4XX_OST_ENABLE;
	} else {
		gpio_direction_output(pin, 1);
		gpio_direction_input(pin);
		*IXP4XX_OSRT2 = 0;
	}

	spin_unlock_irqrestore(&beep_lock, flags);
}

static int ixp4xx_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
{
	unsigned int pin = (unsigned int) input_get_drvdata(dev);
	unsigned int count = 0;

	if (type != EV_SND)
		return -1;

	switch (code) {
		case SND_BELL:
			if (value)
				value = 1000;
		case SND_TONE:
			break;
		default:
			return -1;
	}

	if (value > 20 && value < 32767)
		count = (IXP4XX_TIMER_FREQ / (value * 4)) - 1;

	ixp4xx_spkr_control(pin, count);

	return 0;
}

static irqreturn_t ixp4xx_spkr_interrupt(int irq, void *dev_id)
{
	unsigned int pin = (unsigned int) dev_id;

	/* clear interrupt */
	*IXP4XX_OSST = IXP4XX_OSST_TIMER_2_PEND;

	/* flip the beeper output */
	gpio_set_value(pin, !gpio_get_value(pin));

	return IRQ_HANDLED;
}

static int ixp4xx_spkr_probe(struct platform_device *dev)
{
	struct input_dev *input_dev;
	int err;

	input_dev = input_allocate_device();
	if (!input_dev)
		return -ENOMEM;

	input_set_drvdata(input_dev, (void *) dev->id);

	input_dev->name = "ixp4xx beeper",
	input_dev->phys = "ixp4xx/gpio";
	input_dev->id.bustype = BUS_HOST;
	input_dev->id.vendor  = 0x001f;
	input_dev->id.product = 0x0001;
	input_dev->id.version = 0x0100;
	input_dev->dev.parent = &dev->dev;

	input_dev->evbit[0] = BIT_MASK(EV_SND);
	input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
	input_dev->event = ixp4xx_spkr_event;

	err = gpio_request(dev->id, "ixp4-beeper");
	if (err)
		goto err_free_device;

	err = request_irq(IRQ_IXP4XX_TIMER2, &ixp4xx_spkr_interrupt,
			  IRQF_NO_SUSPEND, "ixp4xx-beeper",
			  (void *) dev->id);
	if (err)
		goto err_free_gpio;

	err = input_register_device(input_dev);
	if (err)
		goto err_free_irq;

	platform_set_drvdata(dev, input_dev);

	return 0;

 err_free_irq:
	free_irq(IRQ_IXP4XX_TIMER2, (void *)dev->id);
 err_free_gpio:
	gpio_free(dev->id);
 err_free_device:
	input_free_device(input_dev);

	return err;
}

static int ixp4xx_spkr_remove(struct platform_device *dev)
{
	struct input_dev *input_dev = platform_get_drvdata(dev);
	unsigned int pin = (unsigned int) input_get_drvdata(input_dev);

	input_unregister_device(input_dev);

	/* turn the speaker off */
	disable_irq(IRQ_IXP4XX_TIMER2);
	ixp4xx_spkr_control(pin, 0);

	free_irq(IRQ_IXP4XX_TIMER2, (void *)dev->id);
	gpio_free(dev->id);

	return 0;
}

static void ixp4xx_spkr_shutdown(struct platform_device *dev)
{
	struct input_dev *input_dev = platform_get_drvdata(dev);
	unsigned int pin = (unsigned int) input_get_drvdata(input_dev);

	/* turn off the speaker */
	disable_irq(IRQ_IXP4XX_TIMER2);
	ixp4xx_spkr_control(pin, 0);
}

static struct platform_driver ixp4xx_spkr_platform_driver = {
	.driver		= {
		.name	= "ixp4xx-beeper",
		.owner	= THIS_MODULE,
	},
	.probe		= ixp4xx_spkr_probe,
	.remove		= ixp4xx_spkr_remove,
	.shutdown	= ixp4xx_spkr_shutdown,
};
module_platform_driver(ixp4xx_spkr_platform_driver);
Commit	Line	Data
01387959 AZ	1	/*
	2	* Generic IXP4xx beeper driver
	3	*
	4	* Copyright (C) 2005 Tower Technologies
	5	*
	6	* based on nslu2-io.c
	7	* Copyright (C) 2004 Karen Spearel
	8	*
	9	* Author: Alessandro Zummo <a.zummo@towertech.it>
	10	* Maintainers: http://www.nslu2-linux.org/
	11	*
	12	* This program is free software; you can redistribute it and/or modify
	13	* it under the terms of the GNU General Public License version 2 as
	14	* published by the Free Software Foundation.
	15	*
	16	*/
	17
	18	#include <linux/module.h>
	19	#include <linux/input.h>
	20	#include <linux/delay.h>
	21	#include <linux/platform_device.h>
a09d31ff	22	#include <linux/interrupt.h>
e9c9fc23	23	#include <linux/gpio.h>
a09e64fb	24	#include <mach/hardware.h>
01387959 AZ	25
	26	MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
	27	MODULE_DESCRIPTION("ixp4xx beeper driver");
	28	MODULE_LICENSE("GPL");
589499c0	29	MODULE_ALIAS("platform:ixp4xx-beeper");
01387959 AZ	30
	31	static DEFINE_SPINLOCK(beep_lock);
	32
	33	static void ixp4xx_spkr_control(unsigned int pin, unsigned int count)
	34	{
	35	unsigned long flags;
	36
	37	spin_lock_irqsave(&beep_lock, flags);
	38
e9c9fc23 LW	39	if (count) {
e9c9fc23 LW	40	gpio_direction_output(pin, 0);
01387959 AZ	41	*IXP4XX_OSRT2 = (count & ~IXP4XX_OST_RELOAD_MASK) \| IXP4XX_OST_ENABLE;
01387959 AZ	42	} else {
e9c9fc23 LW	43	gpio_direction_output(pin, 1);
e9c9fc23 LW	44	gpio_direction_input(pin);
01387959 AZ	45	*IXP4XX_OSRT2 = 0;
	46	}
	47
	48	spin_unlock_irqrestore(&beep_lock, flags);
	49	}
	50
	51	static int ixp4xx_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
	52	{
643bd272	53	unsigned int pin = (unsigned int) input_get_drvdata(dev);
01387959 AZ	54	unsigned int count = 0;
	55
	56	if (type != EV_SND)
	57	return -1;
	58
	59	switch (code) {
	60	case SND_BELL:
	61	if (value)
	62	value = 1000;
	63	case SND_TONE:
	64	break;
	65	default:
	66	return -1;
	67	}
	68
	69	if (value > 20 && value < 32767)
e66a022a	70	count = (IXP4XX_TIMER_FREQ / (value * 4)) - 1;
01387959 AZ	71
	72	ixp4xx_spkr_control(pin, count);
	73
	74	return 0;
	75	}
	76
7d12e780	77	static irqreturn_t ixp4xx_spkr_interrupt(int irq, void *dev_id)
01387959	78	{
b22973d0 LW	79	unsigned int pin = (unsigned int) dev_id;
b22973d0 LW	80
01387959 AZ	81	/* clear interrupt */
	82	*IXP4XX_OSST = IXP4XX_OSST_TIMER_2_PEND;
	83
	84	/* flip the beeper output */
b22973d0	85	gpio_set_value(pin, !gpio_get_value(pin));
01387959 AZ	86
	87	return IRQ_HANDLED;
	88	}
	89
5298cc4c	90	static int ixp4xx_spkr_probe(struct platform_device *dev)
01387959 AZ	91	{
	92	struct input_dev *input_dev;
	93	int err;
	94
	95	input_dev = input_allocate_device();
	96	if (!input_dev)
	97	return -ENOMEM;
	98
373f9713 DT	99	input_set_drvdata(input_dev, (void *) dev->id);
373f9713 DT	100
01387959 AZ	101	input_dev->name = "ixp4xx beeper",
	102	input_dev->phys = "ixp4xx/gpio";
	103	input_dev->id.bustype = BUS_HOST;
	104	input_dev->id.vendor = 0x001f;
	105	input_dev->id.product = 0x0001;
	106	input_dev->id.version = 0x0100;
293e6392	107	input_dev->dev.parent = &dev->dev;
01387959	108
7b19ada2 JS	109	input_dev->evbit[0] = BIT_MASK(EV_SND);
7b19ada2 JS	110	input_dev->sndbit[0] = BIT_MASK(SND_BELL) \| BIT_MASK(SND_TONE);
01387959 AZ	111	input_dev->event = ixp4xx_spkr_event;
01387959 AZ	112
b22973d0 LW	113	err = gpio_request(dev->id, "ixp4-beeper");
	114	if (err)
	115	goto err_free_device;
	116
01387959	117	err = request_irq(IRQ_IXP4XX_TIMER2, &ixp4xx_spkr_interrupt,
ec4665c4	118	IRQF_NO_SUSPEND, "ixp4xx-beeper",
2dd93203	119	(void *) dev->id);
01387959	120	if (err)
b22973d0	121	goto err_free_gpio;
01387959 AZ	122
	123	err = input_register_device(input_dev);
	124	if (err)
	125	goto err_free_irq;
	126
	127	platform_set_drvdata(dev, input_dev);
	128
	129	return 0;
	130
	131	err_free_irq:
25c9b7bd	132	free_irq(IRQ_IXP4XX_TIMER2, (void *)dev->id);
b22973d0 LW	133	err_free_gpio:
b22973d0 LW	134	gpio_free(dev->id);
01387959 AZ	135	err_free_device:
	136	input_free_device(input_dev);
	137
	138	return err;
	139	}
	140
e2619cf7	141	static int ixp4xx_spkr_remove(struct platform_device *dev)
01387959 AZ	142	{
01387959 AZ	143	struct input_dev *input_dev = platform_get_drvdata(dev);
373f9713	144	unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
01387959 AZ	145
01387959 AZ	146	input_unregister_device(input_dev);
01387959 AZ	147
	148	/* turn the speaker off */
	149	disable_irq(IRQ_IXP4XX_TIMER2);
	150	ixp4xx_spkr_control(pin, 0);
	151
25c9b7bd	152	free_irq(IRQ_IXP4XX_TIMER2, (void *)dev->id);
b22973d0	153	gpio_free(dev->id);
01387959 AZ	154
	155	return 0;
	156	}
	157
	158	static void ixp4xx_spkr_shutdown(struct platform_device *dev)
	159	{
	160	struct input_dev *input_dev = platform_get_drvdata(dev);
373f9713	161	unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
01387959 AZ	162
	163	/* turn off the speaker */
	164	disable_irq(IRQ_IXP4XX_TIMER2);
	165	ixp4xx_spkr_control(pin, 0);
	166	}
	167
	168	static struct platform_driver ixp4xx_spkr_platform_driver = {
	169	.driver = {
	170	.name = "ixp4xx-beeper",
	171	.owner = THIS_MODULE,
	172	},
	173	.probe = ixp4xx_spkr_probe,
1cb0aa88	174	.remove = ixp4xx_spkr_remove,
01387959 AZ	175	.shutdown = ixp4xx_spkr_shutdown,
01387959 AZ	176	};
840a746b	177	module_platform_driver(ixp4xx_spkr_platform_driver);
01387959	178