[mirror_ubuntu-hirsute-kernel.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 int ixp4xx_timer2_irq;

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 irq;
	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;

	irq = platform_get_irq(dev, 0);
	if (irq < 0) {
		err = irq;
		goto err_free_device;
	}

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

	err = request_irq(irq, &ixp4xx_spkr_interrupt,
			  IRQF_NO_SUSPEND, "ixp4xx-beeper",
			  (void *) dev->id);
	if (err)
		goto err_free_gpio;
	ixp4xx_timer2_irq = irq;

	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, (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(ixp4xx_timer2_irq);
	ixp4xx_spkr_control(pin, 0);

	free_irq(ixp4xx_timer2_irq, (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(ixp4xx_timer2_irq);
	ixp4xx_spkr_control(pin, 0);
}

static struct platform_driver ixp4xx_spkr_platform_driver = {
	.driver		= {
		.name	= "ixp4xx-beeper",
	},
	.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
075df31a LW	33	static int ixp4xx_timer2_irq;
075df31a LW	34
01387959 AZ	35	static void ixp4xx_spkr_control(unsigned int pin, unsigned int count)
	36	{
	37	unsigned long flags;
	38
	39	spin_lock_irqsave(&beep_lock, flags);
	40
e9c9fc23 LW	41	if (count) {
e9c9fc23 LW	42	gpio_direction_output(pin, 0);
01387959 AZ	43	*IXP4XX_OSRT2 = (count & ~IXP4XX_OST_RELOAD_MASK) \| IXP4XX_OST_ENABLE;
01387959 AZ	44	} else {
e9c9fc23 LW	45	gpio_direction_output(pin, 1);
e9c9fc23 LW	46	gpio_direction_input(pin);
01387959 AZ	47	*IXP4XX_OSRT2 = 0;
	48	}
	49
	50	spin_unlock_irqrestore(&beep_lock, flags);
	51	}
	52
	53	static int ixp4xx_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
	54	{
643bd272	55	unsigned int pin = (unsigned int) input_get_drvdata(dev);
01387959 AZ	56	unsigned int count = 0;
	57
	58	if (type != EV_SND)
	59	return -1;
	60
	61	switch (code) {
	62	case SND_BELL:
	63	if (value)
	64	value = 1000;
	65	case SND_TONE:
	66	break;
	67	default:
	68	return -1;
	69	}
	70
	71	if (value > 20 && value < 32767)
3ae1a6b1	72	count = (ixp4xx_timer_freq / (value * 4)) - 1;
01387959 AZ	73
	74	ixp4xx_spkr_control(pin, count);
	75
	76	return 0;
	77	}
	78
7d12e780	79	static irqreturn_t ixp4xx_spkr_interrupt(int irq, void *dev_id)
01387959	80	{
b22973d0 LW	81	unsigned int pin = (unsigned int) dev_id;
b22973d0 LW	82
01387959 AZ	83	/* clear interrupt */
	84	*IXP4XX_OSST = IXP4XX_OSST_TIMER_2_PEND;
	85
	86	/* flip the beeper output */
b22973d0	87	gpio_set_value(pin, !gpio_get_value(pin));
01387959 AZ	88
	89	return IRQ_HANDLED;
	90	}
	91
5298cc4c	92	static int ixp4xx_spkr_probe(struct platform_device *dev)
01387959 AZ	93	{
01387959 AZ	94	struct input_dev *input_dev;
075df31a	95	int irq;
01387959 AZ	96	int err;
	97
	98	input_dev = input_allocate_device();
	99	if (!input_dev)
	100	return -ENOMEM;
	101
373f9713 DT	102	input_set_drvdata(input_dev, (void *) dev->id);
373f9713 DT	103
01387959 AZ	104	input_dev->name = "ixp4xx beeper",
	105	input_dev->phys = "ixp4xx/gpio";
	106	input_dev->id.bustype = BUS_HOST;
	107	input_dev->id.vendor = 0x001f;
	108	input_dev->id.product = 0x0001;
	109	input_dev->id.version = 0x0100;
293e6392	110	input_dev->dev.parent = &dev->dev;
01387959	111
7b19ada2 JS	112	input_dev->evbit[0] = BIT_MASK(EV_SND);
7b19ada2 JS	113	input_dev->sndbit[0] = BIT_MASK(SND_BELL) \| BIT_MASK(SND_TONE);
01387959 AZ	114	input_dev->event = ixp4xx_spkr_event;
01387959 AZ	115
075df31a LW	116	irq = platform_get_irq(dev, 0);
	117	if (irq < 0) {
	118	err = irq;
	119	goto err_free_device;
	120	}
	121
b22973d0 LW	122	err = gpio_request(dev->id, "ixp4-beeper");
	123	if (err)
	124	goto err_free_device;
	125
075df31a	126	err = request_irq(irq, &ixp4xx_spkr_interrupt,
ec4665c4	127	IRQF_NO_SUSPEND, "ixp4xx-beeper",
2dd93203	128	(void *) dev->id);
01387959	129	if (err)
b22973d0	130	goto err_free_gpio;
075df31a	131	ixp4xx_timer2_irq = irq;
01387959 AZ	132
	133	err = input_register_device(input_dev);
	134	if (err)
	135	goto err_free_irq;
	136
	137	platform_set_drvdata(dev, input_dev);
	138
	139	return 0;
	140
	141	err_free_irq:
075df31a	142	free_irq(irq, (void *)dev->id);
b22973d0 LW	143	err_free_gpio:
b22973d0 LW	144	gpio_free(dev->id);
01387959 AZ	145	err_free_device:
	146	input_free_device(input_dev);
	147
	148	return err;
	149	}
	150
e2619cf7	151	static int ixp4xx_spkr_remove(struct platform_device *dev)
01387959 AZ	152	{
01387959 AZ	153	struct input_dev *input_dev = platform_get_drvdata(dev);
373f9713	154	unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
01387959 AZ	155
01387959 AZ	156	input_unregister_device(input_dev);
01387959 AZ	157
01387959 AZ	158	/* turn the speaker off */
075df31a	159	disable_irq(ixp4xx_timer2_irq);
01387959 AZ	160	ixp4xx_spkr_control(pin, 0);
01387959 AZ	161
075df31a	162	free_irq(ixp4xx_timer2_irq, (void *)dev->id);
b22973d0	163	gpio_free(dev->id);
01387959 AZ	164
	165	return 0;
	166	}
	167
	168	static void ixp4xx_spkr_shutdown(struct platform_device *dev)
	169	{
	170	struct input_dev *input_dev = platform_get_drvdata(dev);
373f9713	171	unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
01387959 AZ	172
01387959 AZ	173	/* turn off the speaker */
075df31a	174	disable_irq(ixp4xx_timer2_irq);
01387959 AZ	175	ixp4xx_spkr_control(pin, 0);
	176	}
	177
	178	static struct platform_driver ixp4xx_spkr_platform_driver = {
	179	.driver = {
	180	.name = "ixp4xx-beeper",
01387959 AZ	181	},
01387959 AZ	182	.probe = ixp4xx_spkr_probe,
1cb0aa88	183	.remove = ixp4xx_spkr_remove,
01387959 AZ	184	.shutdown = ixp4xx_spkr_shutdown,
01387959 AZ	185	};
840a746b	186	module_platform_driver(ixp4xx_spkr_platform_driver);
01387959	187