| /* |
| * 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 <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_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) 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) |
| { |
| /* 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 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 = request_irq(IRQ_IXP4XX_TIMER2, &ixp4xx_spkr_interrupt, |
| IRQF_NO_SUSPEND, "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_get_drvdata(input_dev); |
| |
| 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_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); |
| |