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 <asm/hardware.h>
  24
  25 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
  26 MODULE_DESCRIPTION("ixp4xx beeper driver");
  27 MODULE_LICENSE("GPL");
  28
  29 static DEFINE_SPINLOCK(beep_lock);
  30
  31 static 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_line_config(pin, IXP4XX_GPIO_OUT);
  39                 gpio_line_set(pin, IXP4XX_GPIO_LOW);
  40
  41                 *IXP4XX_OSRT2 = (count & ~IXP4XX_OST_RELOAD_MASK) | IXP4XX_OST_ENABLE;
  42         } else {
  43                 gpio_line_config(pin, IXP4XX_GPIO_IN);
  44                 gpio_line_set(pin, IXP4XX_GPIO_HIGH);
  45
  46                 *IXP4XX_OSRT2 = 0;
  47         }
  48
  49         spin_unlock_irqrestore(&beep_lock, flags);
  50 }
  51
  52 static int ixp4xx_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
  53 {
  54         unsigned int pin = (unsigned int) dev->private;
  55         unsigned int count = 0;
  56
  57         if (type != EV_SND)
  58                 return -1;
  59
  60         switch (code) {
  61                 case SND_BELL:
  62                         if (value)
  63                                 value = 1000;
  64                 case SND_TONE:
  65                         break;
  66                 default:
  67                         return -1;
  68         }
  69
  70         if (value > 20 && value < 32767)
  71 #ifndef FREQ
  72                 count = (ixp4xx_get_board_tick_rate() / (value * 4)) - 1;
  73 #else
  74                 count = (FREQ / (value * 4)) - 1;
  75 #endif
  76
  77         ixp4xx_spkr_control(pin, count);
  78
  79         return 0;
  80 }
  81
  82 static irqreturn_t ixp4xx_spkr_interrupt(int irq, void *dev_id)
  83 {
  84         /* clear interrupt */
  85         *IXP4XX_OSST = IXP4XX_OSST_TIMER_2_PEND;
  86
  87         /* flip the beeper output */
  88         *IXP4XX_GPIO_GPOUTR ^= (1 << (unsigned int) dev_id);
  89
  90         return IRQ_HANDLED;
  91 }
  92
  93 static int __devinit ixp4xx_spkr_probe(struct platform_device *dev)
  94 {
  95         struct input_dev *input_dev;
  96         int err;
  97
  98         input_dev = input_allocate_device();
  99         if (!input_dev)
 100                 return -ENOMEM;
 101
 102         input_dev->private = (void *) dev->id;
 103         input_dev->name = "ixp4xx beeper",
 104         input_dev->phys = "ixp4xx/gpio";
 105         input_dev->id.bustype = BUS_HOST;
 106         input_dev->id.vendor  = 0x001f;
 107         input_dev->id.product = 0x0001;
 108         input_dev->id.version = 0x0100;
 109         input_dev->cdev.dev = &dev->dev;
 110
 111         input_dev->evbit[0] = BIT(EV_SND);
 112         input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
 113         input_dev->event = ixp4xx_spkr_event;
 114
 115         err = request_irq(IRQ_IXP4XX_TIMER2, &ixp4xx_spkr_interrupt,
 116                           IRQF_DISABLED | IRQF_TIMER, "ixp4xx-beeper", (void *) dev->id);
 117         if (err)
 118                 goto err_free_device;
 119
 120         err = input_register_device(input_dev);
 121         if (err)
 122                 goto err_free_irq;
 123
 124         platform_set_drvdata(dev, input_dev);
 125
 126         return 0;
 127
 128  err_free_irq:
 129         free_irq(IRQ_IXP4XX_TIMER2, dev);
 130  err_free_device:
 131         input_free_device(input_dev);
 132
 133         return err;
 134 }
 135
 136 static int __devexit ixp4xx_spkr_remove(struct platform_device *dev)
 137 {
 138         struct input_dev *input_dev = platform_get_drvdata(dev);
 139         unsigned int pin = (unsigned int) input_dev->private;
 140
 141         input_unregister_device(input_dev);
 142         platform_set_drvdata(dev, NULL);
 143
 144         /* turn the speaker off */
 145         disable_irq(IRQ_IXP4XX_TIMER2);
 146         ixp4xx_spkr_control(pin, 0);
 147
 148         free_irq(IRQ_IXP4XX_TIMER2, dev);
 149
 150         return 0;
 151 }
 152
 153 static void ixp4xx_spkr_shutdown(struct platform_device *dev)
 154 {
 155         struct input_dev *input_dev = platform_get_drvdata(dev);
 156         unsigned int pin = (unsigned int) input_dev->private;
 157
 158         /* turn off the speaker */
 159         disable_irq(IRQ_IXP4XX_TIMER2);
 160         ixp4xx_spkr_control(pin, 0);
 161 }
 162
 163 static struct platform_driver ixp4xx_spkr_platform_driver = {
 164         .driver         = {
 165                 .name   = "ixp4xx-beeper",
 166                 .owner  = THIS_MODULE,
 167         },
 168         .probe          = ixp4xx_spkr_probe,
 169         .remove         = __devexit_p(ixp4xx_spkr_remove),
 170         .shutdown       = ixp4xx_spkr_shutdown,
 171 };
 172
 173 static int __init ixp4xx_spkr_init(void)
 174 {
 175         return platform_driver_register(&ixp4xx_spkr_platform_driver);
 176 }
 177
 178 static void __exit ixp4xx_spkr_exit(void)
 179 {
 180         platform_driver_unregister(&ixp4xx_spkr_platform_driver);
 181 }
 182
 183 module_init(ixp4xx_spkr_init);
 184 module_exit(ixp4xx_spkr_exit);