/* * 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 <asm/hardware.h> MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); MODULE_DESCRIPTION("ixp4xx beeper driver"); MODULE_LICENSE("GPL"); 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_line_config(pin, IXP4XX_GPIO_OUT); gpio_line_set(pin, IXP4XX_GPIO_LOW); *IXP4XX_OSRT2 = (count & ~IXP4XX_OST_RELOAD_MASK) | IXP4XX_OST_ENABLE; } else { gpio_line_config(pin, IXP4XX_GPIO_IN); gpio_line_set(pin, IXP4XX_GPIO_HIGH); *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) dev->private; 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) #ifndef FREQ count = (ixp4xx_get_board_tick_rate() / (value * 4)) - 1; #else count = (FREQ / (value * 4)) - 1; #endif ixp4xx_spkr_control(pin, count); return 0; } static irqreturn_t ixp4xx_spkr_interrupt(int irq, void *dev_id) { /* clear interrupt */ *IXP4XX_OSST = IXP4XX_OSST_TIMER_2_PEND; /* flip the beeper output */ *IXP4XX_GPIO_GPOUTR ^= (1 << (unsigned int) dev_id); return IRQ_HANDLED; } static int __devinit 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_dev->private = (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->cdev.dev = &dev->dev; input_dev->evbit[0] = BIT(EV_SND); input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE); input_dev->event = ixp4xx_spkr_event; err = request_irq(IRQ_IXP4XX_TIMER2, &ixp4xx_spkr_interrupt, IRQF_DISABLED | IRQF_TIMER, "ixp4xx-beeper", (void *) dev->id); if (err) goto err_free_device; 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, dev); err_free_device: input_free_device(input_dev); return err; } static int __devexit ixp4xx_spkr_remove(struct platform_device *dev) { struct input_dev *input_dev = platform_get_drvdata(dev); unsigned int pin = (unsigned int) input_dev->private; input_unregister_device(input_dev); platform_set_drvdata(dev, NULL); /* turn the speaker off */ disable_irq(IRQ_IXP4XX_TIMER2); ixp4xx_spkr_control(pin, 0); free_irq(IRQ_IXP4XX_TIMER2, dev); 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_dev->private; /* 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 = __devexit_p(ixp4xx_spkr_remove), .shutdown = ixp4xx_spkr_shutdown, }; static int __init ixp4xx_spkr_init(void) { return platform_driver_register(&ixp4xx_spkr_platform_driver); } static void __exit ixp4xx_spkr_exit(void) { platform_driver_unregister(&ixp4xx_spkr_platform_driver); } module_init(ixp4xx_spkr_init); module_exit(ixp4xx_spkr_exit);