drivers/input/misc/ixp4xx-beeper.c

   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>
  22 #include <linux/interrupt.h>
  23 #include <mach/hardware.h>
  24
  25 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
  26 MODULE_DESCRIPTION("ixp4xx beeper driver");
  27 MODULE_LICENSE("GPL");
  28 MODULE_ALIAS("platform:ixp4xx-beeper");
  29
  30 static DEFINE_SPINLOCK(beep_lock);
  31
  32 static void ixp4xx_spkr_control(unsigned int pin, unsigned int count)
  33 {
  34         unsigned long flags;
  35
  36         spin_lock_irqsave(&beep_lock, flags);
  37
  38          if (count) {
  39                 gpio_line_config(pin, IXP4XX_GPIO_OUT);
  40                 gpio_line_set(pin, IXP4XX_GPIO_LOW);
  41
  42                 *IXP4XX_OSRT2 = (count & ~IXP4XX_OST_RELOAD_MASK) | IXP4XX_OST_ENABLE;
  43         } else {
  44                 gpio_line_config(pin, IXP4XX_GPIO_IN);
  45                 gpio_line_set(pin, IXP4XX_GPIO_HIGH);
  46
  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 {
  55         unsigned int pin = (unsigned int) input_get_drvdata(dev);
  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)
  72                 count = (IXP4XX_TIMER_FREQ / (value * 4)) - 1;
  73
  74         ixp4xx_spkr_control(pin, count);
  75
  76         return 0;
  77 }
  78
  79 static irqreturn_t ixp4xx_spkr_interrupt(int irq, void *dev_id)
  80 {
  81         /* clear interrupt */
  82         *IXP4XX_OSST = IXP4XX_OSST_TIMER_2_PEND;
  83
  84         /* flip the beeper output */
  85         *IXP4XX_GPIO_GPOUTR ^= (1 << (unsigned int) dev_id);
  86
  87         return IRQ_HANDLED;
  88 }
  89
  90 static int ixp4xx_spkr_probe(struct platform_device *dev)
  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
  99         input_set_drvdata(input_dev, (void *) dev->id);
 100
 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;
 107         input_dev->dev.parent = &dev->dev;
 108
 109         input_dev->evbit[0] = BIT_MASK(EV_SND);
 110         input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
 111         input_dev->event = ixp4xx_spkr_event;
 112
 113         err = request_irq(IRQ_IXP4XX_TIMER2, &ixp4xx_spkr_interrupt,
 114                           IRQF_NO_SUSPEND, "ixp4xx-beeper",
 115                           (void *) dev->id);
 116         if (err)
 117                 goto err_free_device;
 118
 119         err = input_register_device(input_dev);
 120         if (err)
 121                 goto err_free_irq;
 122
 123         platform_set_drvdata(dev, input_dev);
 124
 125         return 0;
 126
 127  err_free_irq:
 128         free_irq(IRQ_IXP4XX_TIMER2, dev);
 129  err_free_device:
 130         input_free_device(input_dev);
 131
 132         return err;
 133 }
 134
 135 static int __devexit ixp4xx_spkr_remove(struct platform_device *dev)
 136 {
 137         struct input_dev *input_dev = platform_get_drvdata(dev);
 138         unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
 139
 140         input_unregister_device(input_dev);
 141         platform_set_drvdata(dev, NULL);
 142
 143         /* turn the speaker off */
 144         disable_irq(IRQ_IXP4XX_TIMER2);
 145         ixp4xx_spkr_control(pin, 0);
 146
 147         free_irq(IRQ_IXP4XX_TIMER2, dev);
 148
 149         return 0;
 150 }
 151
 152 static void ixp4xx_spkr_shutdown(struct platform_device *dev)
 153 {
 154         struct input_dev *input_dev = platform_get_drvdata(dev);
 155         unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
 156
 157         /* turn off the speaker */
 158         disable_irq(IRQ_IXP4XX_TIMER2);
 159         ixp4xx_spkr_control(pin, 0);
 160 }
 161
 162 static struct platform_driver ixp4xx_spkr_platform_driver = {
 163         .driver         = {
 164                 .name   = "ixp4xx-beeper",
 165                 .owner  = THIS_MODULE,
 166         },
 167         .probe          = ixp4xx_spkr_probe,
 168         .remove         = ixp4xx_spkr_remove,
 169         .shutdown       = ixp4xx_spkr_shutdown,
 170 };
 171 module_platform_driver(ixp4xx_spkr_platform_driver);
 172