drivers/input/misc/sparcspkr.c

   1 /*
   2  *  Driver for PC-speaker like devices found on various Sparc systems.
   3  *
   4  *  Copyright (c) 2002 Vojtech Pavlik
   5  *  Copyright (c) 2002 David S. Miller (davem@redhat.com)
   6  */
   7 #include <linux/config.h>
   8 #include <linux/kernel.h>
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/input.h>
  12 #include <linux/platform_device.h>
  13
  14 #include <asm/io.h>
  15 #include <asm/ebus.h>
  16 #ifdef CONFIG_SPARC64
  17 #include <asm/isa.h>
  18 #endif
  19
  20 MODULE_AUTHOR("David S. Miller <davem@redhat.com>");
  21 MODULE_DESCRIPTION("Sparc Speaker beeper driver");
  22 MODULE_LICENSE("GPL");
  23
  24 const char *beep_name;
  25 static unsigned long beep_iobase;
  26 static int (*beep_event)(struct input_dev *dev, unsigned int type, unsigned int code, int value);
  27 static DEFINE_SPINLOCK(beep_lock);
  28
  29 static int ebus_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
  30 {
  31         unsigned int count = 0;
  32         unsigned long flags;
  33
  34         if (type != EV_SND)
  35                 return -1;
  36
  37         switch (code) {
  38                 case SND_BELL: if (value) value = 1000;
  39                 case SND_TONE: break;
  40                 default: return -1;
  41         }
  42
  43         if (value > 20 && value < 32767)
  44                 count = 1193182 / value;
  45
  46         spin_lock_irqsave(&beep_lock, flags);
  47
  48         /* EBUS speaker only has on/off state, the frequency does not
  49          * appear to be programmable.
  50          */
  51         if (beep_iobase & 0x2UL)
  52                 outb(!!count, beep_iobase);
  53         else
  54                 outl(!!count, beep_iobase);
  55
  56         spin_unlock_irqrestore(&beep_lock, flags);
  57
  58         return 0;
  59 }
  60
  61 #ifdef CONFIG_SPARC64
  62 static int isa_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
  63 {
  64         unsigned int count = 0;
  65         unsigned long flags;
  66
  67         if (type != EV_SND)
  68                 return -1;
  69
  70         switch (code) {
  71                 case SND_BELL: if (value) value = 1000;
  72                 case SND_TONE: break;
  73                 default: return -1;
  74         }
  75
  76         if (value > 20 && value < 32767)
  77                 count = 1193182 / value;
  78
  79         spin_lock_irqsave(&beep_lock, flags);
  80
  81         if (count) {
  82                 /* enable counter 2 */
  83                 outb(inb(beep_iobase + 0x61) | 3, beep_iobase + 0x61);
  84                 /* set command for counter 2, 2 byte write */
  85                 outb(0xB6, beep_iobase + 0x43);
  86                 /* select desired HZ */
  87                 outb(count & 0xff, beep_iobase + 0x42);
  88                 outb((count >> 8) & 0xff, beep_iobase + 0x42);
  89         } else {
  90                 /* disable counter 2 */
  91                 outb(inb_p(beep_iobase + 0x61) & 0xFC, beep_iobase + 0x61);
  92         }
  93
  94         spin_unlock_irqrestore(&beep_lock, flags);
  95
  96         return 0;
  97 }
  98 #endif
  99
 100 static int __devinit sparcspkr_probe(struct platform_device *dev)
 101 {
 102         struct input_dev *input_dev;
 103         int error;
 104
 105         input_dev = input_allocate_device();
 106         if (!input_dev)
 107                 return -ENOMEM;
 108
 109         input_dev->name = beep_name;
 110         input_dev->phys = "sparc/input0";
 111         input_dev->id.bustype = BUS_ISA;
 112         input_dev->id.vendor = 0x001f;
 113         input_dev->id.product = 0x0001;
 114         input_dev->id.version = 0x0100;
 115         input_dev->cdev.dev = &dev->dev;
 116
 117         input_dev->evbit[0] = BIT(EV_SND);
 118         input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
 119
 120         input_dev->event = beep_event;
 121
 122         error = input_register_device(input_dev);
 123         if (error) {
 124                 input_free_device(input_dev);
 125                 return error;
 126         }
 127
 128         platform_set_drvdata(dev, input_dev);
 129
 130         return 0;
 131 }
 132
 133 static int __devexit sparcspkr_remove(struct platform_device *dev)
 134 {
 135         struct input_dev *input_dev = platform_get_drvdata(dev);
 136
 137         input_unregister_device(input_dev);
 138         platform_set_drvdata(dev, NULL);
 139         /* turn off the speaker */
 140         beep_event(NULL, EV_SND, SND_BELL, 0);
 141
 142         return 0;
 143 }
 144
 145 static void sparcspkr_shutdown(struct platform_device *dev)
 146 {
 147         /* turn off the speaker */
 148         beep_event(NULL, EV_SND, SND_BELL, 0);
 149 }
 150
 151 static struct platform_driver sparcspkr_platform_driver = {
 152         .driver         = {
 153                 .name   = "sparcspkr",
 154                 .owner  = THIS_MODULE,
 155         },
 156         .probe          = sparcspkr_probe,
 157         .remove         = __devexit_p(sparcspkr_remove),
 158         .shutdown       = sparcspkr_shutdown,
 159 };
 160
 161 static struct platform_device *sparcspkr_platform_device;
 162
 163 static int __init sparcspkr_drv_init(void)
 164 {
 165         int error;
 166
 167         error = platform_driver_register(&sparcspkr_platform_driver);
 168         if (error)
 169                 return error;
 170
 171         sparcspkr_platform_device = platform_device_alloc("sparcspkr", -1);
 172         if (!sparcspkr_platform_device) {
 173                 error = -ENOMEM;
 174                 goto err_unregister_driver;
 175         }
 176
 177         error = platform_device_add(sparcspkr_platform_device);
 178         if (error)
 179                 goto err_free_device;
 180
 181         return 0;
 182
 183  err_free_device:
 184         platform_device_put(sparcspkr_platform_device);
 185  err_unregister_driver:
 186         platform_driver_unregister(&sparcspkr_platform_driver);
 187
 188         return error;
 189 }
 190
 191 static int __init sparcspkr_init(void)
 192 {
 193         struct linux_ebus *ebus;
 194         struct linux_ebus_device *edev;
 195 #ifdef CONFIG_SPARC64
 196         struct sparc_isa_bridge *isa_br;
 197         struct sparc_isa_device *isa_dev;
 198 #endif
 199
 200         for_each_ebus(ebus) {
 201                 for_each_ebusdev(edev, ebus) {
 202                         if (!strcmp(edev->prom_name, "beep")) {
 203                                 beep_name = "Sparc EBUS Speaker";
 204                                 beep_event = ebus_spkr_event;
 205                                 beep_iobase = edev->resource[0].start;
 206                                 return sparcspkr_drv_init();
 207                         }
 208                 }
 209         }
 210 #ifdef CONFIG_SPARC64
 211         for_each_isa(isa_br) {
 212                 for_each_isadev(isa_dev, isa_br) {
 213                         /* A hack, the beep device's base lives in
 214                          * the DMA isa node.
 215                          */
 216                         if (!strcmp(isa_dev->prom_name, "dma")) {
 217                                 beep_name = "Sparc ISA Speaker";
 218                                 beep_event = isa_spkr_event,
 219                                 beep_iobase = isa_dev->resource.start;
 220                                 return sparcspkr_drv_init();
 221                         }
 222                 }
 223         }
 224 #endif
 225
 226         return -ENODEV;
 227 }
 228
 229 static void __exit sparcspkr_exit(void)
 230 {
 231         platform_device_unregister(sparcspkr_platform_device);
 232         platform_driver_unregister(&sparcspkr_platform_driver);
 233 }
 234
 235 module_init(sparcspkr_init);
 236 module_exit(sparcspkr_exit);