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 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 #ifndef FREQ
  73                 count = (ixp4xx_get_board_tick_rate() / (value * 4)) - 1;
  74 #else
  75                 count = (FREQ / (value * 4)) - 1;
  76 #endif
  77
  78         ixp4xx_spkr_control(pin, count);
  79
  80         return 0;
  81 }
  82
  83 static irqreturn_t ixp4xx_spkr_interrupt(int irq, void *dev_id)
  84 {
  85         /* clear interrupt */
  86         *IXP4XX_OSST = IXP4XX_OSST_TIMER_2_PEND;
  87
  88         /* flip the beeper output */
  89         *IXP4XX_GPIO_GPOUTR ^= (1 << (unsigned int) dev_id);
  90
  91         return IRQ_HANDLED;
  92 }
  93
  94 static int __devinit ixp4xx_spkr_probe(struct platform_device *dev)
  95 {
  96         struct input_dev *input_dev;
  97         int err;
  98
  99         input_dev = input_allocate_device();
 100         if (!input_dev)
 101                 return -ENOMEM;
 102
 103         input_set_drvdata(input_dev, (void *) dev->id);
 104
 105         input_dev->name = "ixp4xx beeper",
 106         input_dev->phys = "ixp4xx/gpio";
 107         input_dev->id.bustype = BUS_HOST;
 108         input_dev->id.vendor  = 0x001f;
 109         input_dev->id.product = 0x0001;
 110         input_dev->id.version = 0x0100;
 111         input_dev->dev.parent = &dev->dev;
 112
 113         input_dev->evbit[0] = BIT_MASK(EV_SND);
 114         input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
 115         input_dev->event = ixp4xx_spkr_event;
 116
 117         err = request_irq(IRQ_IXP4XX_TIMER2, &ixp4xx_spkr_interrupt,
 118                           IRQF_DISABLED | IRQF_TIMER, "ixp4xx-beeper", (void *) dev->id);
 119         if (err)
 120                 goto err_free_device;
 121
 122         err = input_register_device(input_dev);
 123         if (err)
 124                 goto err_free_irq;
 125
 126         platform_set_drvdata(dev, input_dev);
 127
 128         return 0;
 129
 130  err_free_irq:
 131         free_irq(IRQ_IXP4XX_TIMER2, dev);
 132  err_free_device:
 133         input_free_device(input_dev);
 134
 135         return err;
 136 }
 137
 138 static int __devexit ixp4xx_spkr_remove(struct platform_device *dev)
 139 {
 140         struct input_dev *input_dev = platform_get_drvdata(dev);
 141         unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
 142
 143         input_unregister_device(input_dev);
 144         platform_set_drvdata(dev, NULL);
 145
 146         /* turn the speaker off */
 147         disable_irq(IRQ_IXP4XX_TIMER2);
 148         ixp4xx_spkr_control(pin, 0);
 149
 150         free_irq(IRQ_IXP4XX_TIMER2, dev);
 151
 152         return 0;
 153 }
 154
 155 static void ixp4xx_spkr_shutdown(struct platform_device *dev)
 156 {
 157         struct input_dev *input_dev = platform_get_drvdata(dev);
 158         unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
 159
 160         /* turn off the speaker */
 161         disable_irq(IRQ_IXP4XX_TIMER2);
 162         ixp4xx_spkr_control(pin, 0);
 163 }
 164
 165 static struct platform_driver ixp4xx_spkr_platform_driver = {
 166         .driver         = {
 167                 .name   = "ixp4xx-beeper",
 168                 .owner  = THIS_MODULE,
 169         },
 170         .probe          = ixp4xx_spkr_probe,
 171         .remove         = __devexit_p(ixp4xx_spkr_remove),
 172         .shutdown       = ixp4xx_spkr_shutdown,
 173 };
 174
 175 static int __init ixp4xx_spkr_init(void)
 176 {
 177         return platform_driver_register(&ixp4xx_spkr_platform_driver);
 178 }
 179
 180 static void __exit ixp4xx_spkr_exit(void)
 181 {
 182         platform_driver_unregister(&ixp4xx_spkr_platform_driver);
 183 }
 184
 185 module_init(ixp4xx_spkr_init);
 186 module_exit(ixp4xx_spkr_exit);