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 <linux/gpio.h>
  24 #include <mach/hardware.h>
  25
  26 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
  27 MODULE_DESCRIPTION("ixp4xx beeper driver");
  28 MODULE_LICENSE("GPL");
  29 MODULE_ALIAS("platform:ixp4xx-beeper");
  30
  31 static DEFINE_SPINLOCK(beep_lock);
  32
  33 static void ixp4xx_spkr_control(unsigned int pin, unsigned int count)
  34 {
  35         unsigned long flags;
  36
  37         spin_lock_irqsave(&beep_lock, flags);
  38
  39         if (count) {
  40                 gpio_direction_output(pin, 0);
  41                 *IXP4XX_OSRT2 = (count & ~IXP4XX_OST_RELOAD_MASK) | IXP4XX_OST_ENABLE;
  42         } else {
  43                 gpio_direction_output(pin, 1);
  44                 gpio_direction_input(pin);
  45                 *IXP4XX_OSRT2 = 0;
  46         }
  47
  48         spin_unlock_irqrestore(&beep_lock, flags);
  49 }
  50
  51 static int ixp4xx_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
  52 {
  53         unsigned int pin = (unsigned int) input_get_drvdata(dev);
  54         unsigned int count = 0;
  55
  56         if (type != EV_SND)
  57                 return -1;
  58
  59         switch (code) {
  60                 case SND_BELL:
  61                         if (value)
  62                                 value = 1000;
  63                 case SND_TONE:
  64                         break;
  65                 default:
  66                         return -1;
  67         }
  68
  69         if (value > 20 && value < 32767)
  70                 count = (IXP4XX_TIMER_FREQ / (value * 4)) - 1;
  71
  72         ixp4xx_spkr_control(pin, count);
  73
  74         return 0;
  75 }
  76
  77 static irqreturn_t ixp4xx_spkr_interrupt(int irq, void *dev_id)
  78 {
  79         unsigned int pin = (unsigned int) dev_id;
  80
  81         /* clear interrupt */
  82         *IXP4XX_OSST = IXP4XX_OSST_TIMER_2_PEND;
  83
  84         /* flip the beeper output */
  85         gpio_set_value(pin, !gpio_get_value(pin));
  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 = gpio_request(dev->id, "ixp4-beeper");
 114         if (err)
 115                 goto err_free_device;
 116
 117         err = request_irq(IRQ_IXP4XX_TIMER2, &ixp4xx_spkr_interrupt,
 118                           IRQF_NO_SUSPEND, "ixp4xx-beeper",
 119                           (void *) dev->id);
 120         if (err)
 121                 goto err_free_gpio;
 122
 123         err = input_register_device(input_dev);
 124         if (err)
 125                 goto err_free_irq;
 126
 127         platform_set_drvdata(dev, input_dev);
 128
 129         return 0;
 130
 131  err_free_irq:
 132         free_irq(IRQ_IXP4XX_TIMER2, (void *)dev->id);
 133  err_free_gpio:
 134         gpio_free(dev->id);
 135  err_free_device:
 136         input_free_device(input_dev);
 137
 138         return err;
 139 }
 140
 141 static int ixp4xx_spkr_remove(struct platform_device *dev)
 142 {
 143         struct input_dev *input_dev = platform_get_drvdata(dev);
 144         unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
 145
 146         input_unregister_device(input_dev);
 147
 148         /* turn the speaker off */
 149         disable_irq(IRQ_IXP4XX_TIMER2);
 150         ixp4xx_spkr_control(pin, 0);
 151
 152         free_irq(IRQ_IXP4XX_TIMER2, (void *)dev->id);
 153         gpio_free(dev->id);
 154
 155         return 0;
 156 }
 157
 158 static void ixp4xx_spkr_shutdown(struct platform_device *dev)
 159 {
 160         struct input_dev *input_dev = platform_get_drvdata(dev);
 161         unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
 162
 163         /* turn off the speaker */
 164         disable_irq(IRQ_IXP4XX_TIMER2);
 165         ixp4xx_spkr_control(pin, 0);
 166 }
 167
 168 static struct platform_driver ixp4xx_spkr_platform_driver = {
 169         .driver         = {
 170                 .name   = "ixp4xx-beeper",
 171                 .owner  = THIS_MODULE,
 172         },
 173         .probe          = ixp4xx_spkr_probe,
 174         .remove         = ixp4xx_spkr_remove,
 175         .shutdown       = ixp4xx_spkr_shutdown,
 176 };
 177 module_platform_driver(ixp4xx_spkr_platform_driver);
 178