1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Generic IXP4xx beeper driver
  4 *
  5 * Copyright (C) 2005 Tower Technologies
  6 *
  7 * based on nslu2-io.c
  8 *  Copyright (C) 2004 Karen Spearel
  9 *
 10 * Author: Alessandro Zummo <a.zummo@towertech.it>
 11 * Maintainers: http://www.nslu2-linux.org/
 12 */
 13
 14#include <linux/module.h>
 15#include <linux/input.h>
 16#include <linux/delay.h>
 17#include <linux/platform_device.h>
 18#include <linux/interrupt.h>
 19#include <linux/gpio.h>
 20#include <mach/hardware.h>
 21
 22MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 23MODULE_DESCRIPTION("ixp4xx beeper driver");
 24MODULE_LICENSE("GPL");
 25MODULE_ALIAS("platform:ixp4xx-beeper");
 26
 27static DEFINE_SPINLOCK(beep_lock);
 28
 29static int ixp4xx_timer2_irq;
 30
 31static void ixp4xx_spkr_control(unsigned int pin, unsigned int count)
 32{
 33	unsigned long flags;
 34
 35	spin_lock_irqsave(&beep_lock, flags);
 36
 37	if (count) {
 38		gpio_direction_output(pin, 0);
 39		*IXP4XX_OSRT2 = (count & ~IXP4XX_OST_RELOAD_MASK) | IXP4XX_OST_ENABLE;
 40	} else {
 41		gpio_direction_output(pin, 1);
 42		gpio_direction_input(pin);
 43		*IXP4XX_OSRT2 = 0;
 44	}
 45
 46	spin_unlock_irqrestore(&beep_lock, flags);
 47}
 48
 49static int ixp4xx_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
 50{
 51	unsigned int pin = (unsigned int) input_get_drvdata(dev);
 52	unsigned int count = 0;
 53
 54	if (type != EV_SND)
 55		return -1;
 56
 57	switch (code) {
 58		case SND_BELL:
 59			if (value)
 60				value = 1000;
 61		case SND_TONE:
 62			break;
 63		default:
 64			return -1;
 65	}
 66
 67	if (value > 20 && value < 32767)
 68		count = (ixp4xx_timer_freq / (value * 4)) - 1;
 69
 70	ixp4xx_spkr_control(pin, count);
 71
 72	return 0;
 73}
 74
 75static irqreturn_t ixp4xx_spkr_interrupt(int irq, void *dev_id)
 76{
 77	unsigned int pin = (unsigned int) dev_id;
 78
 79	/* clear interrupt */
 80	*IXP4XX_OSST = IXP4XX_OSST_TIMER_2_PEND;
 81
 82	/* flip the beeper output */
 83	gpio_set_value(pin, !gpio_get_value(pin));
 84
 85	return IRQ_HANDLED;
 86}
 87
 88static int ixp4xx_spkr_probe(struct platform_device *dev)
 89{
 90	struct input_dev *input_dev;
 91	int irq;
 92	int err;
 93
 94	input_dev = input_allocate_device();
 95	if (!input_dev)
 96		return -ENOMEM;
 97
 98	input_set_drvdata(input_dev, (void *) dev->id);
 99
100	input_dev->name = "ixp4xx beeper",
101	input_dev->phys = "ixp4xx/gpio";
102	input_dev->id.bustype = BUS_HOST;
103	input_dev->id.vendor  = 0x001f;
104	input_dev->id.product = 0x0001;
105	input_dev->id.version = 0x0100;
106	input_dev->dev.parent = &dev->dev;
107
108	input_dev->evbit[0] = BIT_MASK(EV_SND);
109	input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
110	input_dev->event = ixp4xx_spkr_event;
111
112	irq = platform_get_irq(dev, 0);
113	if (irq < 0) {
114		err = irq;
115		goto err_free_device;
116	}
117
118	err = gpio_request(dev->id, "ixp4-beeper");
119	if (err)
120		goto err_free_device;
121
122	err = request_irq(irq, &ixp4xx_spkr_interrupt,
123			  IRQF_NO_SUSPEND, "ixp4xx-beeper",
124			  (void *) dev->id);
125	if (err)
126		goto err_free_gpio;
127	ixp4xx_timer2_irq = irq;
128
129	err = input_register_device(input_dev);
130	if (err)
131		goto err_free_irq;
132
133	platform_set_drvdata(dev, input_dev);
134
135	return 0;
136
137 err_free_irq:
138	free_irq(irq, (void *)dev->id);
139 err_free_gpio:
140	gpio_free(dev->id);
141 err_free_device:
142	input_free_device(input_dev);
143
144	return err;
145}
146
147static int ixp4xx_spkr_remove(struct platform_device *dev)
148{
149	struct input_dev *input_dev = platform_get_drvdata(dev);
150	unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
151
152	input_unregister_device(input_dev);
153
154	/* turn the speaker off */
155	disable_irq(ixp4xx_timer2_irq);
156	ixp4xx_spkr_control(pin, 0);
157
158	free_irq(ixp4xx_timer2_irq, (void *)dev->id);
159	gpio_free(dev->id);
160
161	return 0;
162}
163
164static void ixp4xx_spkr_shutdown(struct platform_device *dev)
165{
166	struct input_dev *input_dev = platform_get_drvdata(dev);
167	unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
168
169	/* turn off the speaker */
170	disable_irq(ixp4xx_timer2_irq);
171	ixp4xx_spkr_control(pin, 0);
172}
173
174static struct platform_driver ixp4xx_spkr_platform_driver = {
175	.driver		= {
176		.name	= "ixp4xx-beeper",
177	},
178	.probe		= ixp4xx_spkr_probe,
179	.remove		= ixp4xx_spkr_remove,
180	.shutdown	= ixp4xx_spkr_shutdown,
181};
182module_platform_driver(ixp4xx_spkr_platform_driver);
183