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, 2006, 2008 David S. Miller (davem@davemloft.net)
   6  */
   7 #include <linux/kernel.h>
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/input.h>
  11 #include <linux/of_device.h>
  12
  13 #include <asm/io.h>
  14
  15 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
  16 MODULE_DESCRIPTION("Sparc Speaker beeper driver");
  17 MODULE_LICENSE("GPL");
  18
  19 struct grover_beep_info {
  20         void __iomem    *freq_regs;
  21         void __iomem    *enable_reg;
  22 };
  23
  24 struct bbc_beep_info {
  25         u32             clock_freq;
  26         void __iomem    *regs;
  27 };
  28
  29 struct sparcspkr_state {
  30         const char              *name;
  31         int (*event)(struct input_dev *dev, unsigned int type, unsigned int code, int value);
  32         spinlock_t              lock;
  33         struct input_dev        *input_dev;
  34         union {
  35                 struct grover_beep_info grover;
  36                 struct bbc_beep_info bbc;
  37         } u;
  38 };
  39
  40 static u32 bbc_count_to_reg(struct bbc_beep_info *info, unsigned int count)
  41 {
  42         u32 val, clock_freq = info->clock_freq;
  43         int i;
  44
  45         if (!count)
  46                 return 0;
  47
  48         if (count <= clock_freq >> 20)
  49                 return 1 << 18;
  50
  51         if (count >= clock_freq >> 12)
  52                 return 1 << 10;
  53
  54         val = 1 << 18;
  55         for (i = 19; i >= 11; i--) {
  56                 val >>= 1;
  57                 if (count <= clock_freq >> i)
  58                         break;
  59         }
  60
  61         return val;
  62 }
  63
  64 static int bbc_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
  65 {
  66         struct sparcspkr_state *state = dev_get_drvdata(dev->dev.parent);
  67         struct bbc_beep_info *info = &state->u.bbc;
  68         unsigned int count = 0;
  69         unsigned long flags;
  70
  71         if (type != EV_SND)
  72                 return -1;
  73
  74         switch (code) {
  75                 case SND_BELL: if (value) value = 1000;
  76                 case SND_TONE: break;
  77                 default: return -1;
  78         }
  79
  80         if (value > 20 && value < 32767)
  81                 count = 1193182 / value;
  82
  83         count = bbc_count_to_reg(info, count);
  84
  85         spin_lock_irqsave(&state->lock, flags);
  86
  87         if (count) {
  88                 outb(0x01,                 info->regs + 0);
  89                 outb(0x00,                 info->regs + 2);
  90                 outb((count >> 16) & 0xff, info->regs + 3);
  91                 outb((count >>  8) & 0xff, info->regs + 4);
  92                 outb(0x00,                 info->regs + 5);
  93         } else {
  94                 outb(0x00,                 info->regs + 0);
  95         }
  96
  97         spin_unlock_irqrestore(&state->lock, flags);
  98
  99         return 0;
 100 }
 101
 102 static int grover_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
 103 {
 104         struct sparcspkr_state *state = dev_get_drvdata(dev->dev.parent);
 105         struct grover_beep_info *info = &state->u.grover;
 106         unsigned int count = 0;
 107         unsigned long flags;
 108
 109         if (type != EV_SND)
 110                 return -1;
 111
 112         switch (code) {
 113                 case SND_BELL: if (value) value = 1000;
 114                 case SND_TONE: break;
 115                 default: return -1;
 116         }
 117
 118         if (value > 20 && value < 32767)
 119                 count = 1193182 / value;
 120
 121         spin_lock_irqsave(&state->lock, flags);
 122
 123         if (count) {
 124                 /* enable counter 2 */
 125                 outb(inb(info->enable_reg) | 3, info->enable_reg);
 126                 /* set command for counter 2, 2 byte write */
 127                 outb(0xB6, info->freq_regs + 1);
 128                 /* select desired HZ */
 129                 outb(count & 0xff, info->freq_regs + 0);
 130                 outb((count >> 8) & 0xff, info->freq_regs + 0);
 131         } else {
 132                 /* disable counter 2 */
 133                 outb(inb_p(info->enable_reg) & 0xFC, info->enable_reg);
 134         }
 135
 136         spin_unlock_irqrestore(&state->lock, flags);
 137
 138         return 0;
 139 }
 140
 141 static int __devinit sparcspkr_probe(struct device *dev)
 142 {
 143         struct sparcspkr_state *state = dev_get_drvdata(dev);
 144         struct input_dev *input_dev;
 145         int error;
 146
 147         input_dev = input_allocate_device();
 148         if (!input_dev)
 149                 return -ENOMEM;
 150
 151         input_dev->name = state->name;
 152         input_dev->phys = "sparc/input0";
 153         input_dev->id.bustype = BUS_ISA;
 154         input_dev->id.vendor = 0x001f;
 155         input_dev->id.product = 0x0001;
 156         input_dev->id.version = 0x0100;
 157         input_dev->dev.parent = dev;
 158
 159         input_dev->evbit[0] = BIT_MASK(EV_SND);
 160         input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
 161
 162         input_dev->event = state->event;
 163
 164         error = input_register_device(input_dev);
 165         if (error) {
 166                 input_free_device(input_dev);
 167                 return error;
 168         }
 169
 170         state->input_dev = input_dev;
 171
 172         return 0;
 173 }
 174
 175 static int sparcspkr_shutdown(struct of_device *dev)
 176 {
 177         struct sparcspkr_state *state = dev_get_drvdata(&dev->dev);
 178         struct input_dev *input_dev = state->input_dev;
 179
 180         /* turn off the speaker */
 181         state->event(input_dev, EV_SND, SND_BELL, 0);
 182
 183         return 0;
 184 }
 185
 186 static int __devinit bbc_beep_probe(struct of_device *op, const struct of_device_id *match)
 187 {
 188         struct sparcspkr_state *state;
 189         struct bbc_beep_info *info;
 190         struct device_node *dp;
 191         int err = -ENOMEM;
 192
 193         state = kzalloc(sizeof(*state), GFP_KERNEL);
 194         if (!state)
 195                 goto out_err;
 196
 197         state->name = "Sparc BBC Speaker";
 198         state->event = bbc_spkr_event;
 199         spin_lock_init(&state->lock);
 200
 201         dp = of_find_node_by_path("/");
 202         err = -ENODEV;
 203         if (!dp)
 204                 goto out_free;
 205
 206         info = &state->u.bbc;
 207         info->clock_freq = of_getintprop_default(dp, "clock-frequency", 0);
 208         if (!info->clock_freq)
 209                 goto out_free;
 210
 211         info->regs = of_ioremap(&op->resource[0], 0, 6, "bbc beep");
 212         if (!info->regs)
 213                 goto out_free;
 214
 215         dev_set_drvdata(&op->dev, state);
 216
 217         err = sparcspkr_probe(&op->dev);
 218         if (err)
 219                 goto out_clear_drvdata;
 220
 221         return 0;
 222
 223 out_clear_drvdata:
 224         dev_set_drvdata(&op->dev, NULL);
 225         of_iounmap(&op->resource[0], info->regs, 6);
 226
 227 out_free:
 228         kfree(state);
 229 out_err:
 230         return err;
 231 }
 232
 233 static int __devexit bbc_remove(struct of_device *op)
 234 {
 235         struct sparcspkr_state *state = dev_get_drvdata(&op->dev);
 236         struct input_dev *input_dev = state->input_dev;
 237         struct bbc_beep_info *info = &state->u.bbc;
 238
 239         /* turn off the speaker */
 240         state->event(input_dev, EV_SND, SND_BELL, 0);
 241
 242         input_unregister_device(input_dev);
 243
 244         of_iounmap(&op->resource[0], info->regs, 6);
 245
 246         dev_set_drvdata(&op->dev, NULL);
 247         kfree(state);
 248
 249         return 0;
 250 }
 251
 252 static const struct of_device_id bbc_beep_match[] = {
 253         {
 254                 .name = "beep",
 255                 .compatible = "SUNW,bbc-beep",
 256         },
 257         {},
 258 };
 259
 260 static struct of_platform_driver bbc_beep_driver = {
 261         .name           = "bbcbeep",
 262         .match_table    = bbc_beep_match,
 263         .probe          = bbc_beep_probe,
 264         .remove         = __devexit_p(bbc_remove),
 265         .shutdown       = sparcspkr_shutdown,
 266 };
 267
 268 static int __devinit grover_beep_probe(struct of_device *op, const struct of_device_id *match)
 269 {
 270         struct sparcspkr_state *state;
 271         struct grover_beep_info *info;
 272         int err = -ENOMEM;
 273
 274         state = kzalloc(sizeof(*state), GFP_KERNEL);
 275         if (!state)
 276                 goto out_err;
 277
 278         state->name = "Sparc Grover Speaker";
 279         state->event = grover_spkr_event;
 280         spin_lock_init(&state->lock);
 281
 282         info = &state->u.grover;
 283         info->freq_regs = of_ioremap(&op->resource[2], 0, 2, "grover beep freq");
 284         if (!info->freq_regs)
 285                 goto out_free;
 286
 287         info->enable_reg = of_ioremap(&op->resource[3], 0, 1, "grover beep enable");
 288         if (!info->enable_reg)
 289                 goto out_unmap_freq_regs;
 290
 291         dev_set_drvdata(&op->dev, state);
 292
 293         err = sparcspkr_probe(&op->dev);
 294         if (err)
 295                 goto out_clear_drvdata;
 296
 297         return 0;
 298
 299 out_clear_drvdata:
 300         dev_set_drvdata(&op->dev, NULL);
 301         of_iounmap(&op->resource[3], info->enable_reg, 1);
 302
 303 out_unmap_freq_regs:
 304         of_iounmap(&op->resource[2], info->freq_regs, 2);
 305 out_free:
 306         kfree(state);
 307 out_err:
 308         return err;
 309 }
 310
 311 static int __devexit grover_remove(struct of_device *op)
 312 {
 313         struct sparcspkr_state *state = dev_get_drvdata(&op->dev);
 314         struct grover_beep_info *info = &state->u.grover;
 315         struct input_dev *input_dev = state->input_dev;
 316
 317         /* turn off the speaker */
 318         state->event(input_dev, EV_SND, SND_BELL, 0);
 319
 320         input_unregister_device(input_dev);
 321
 322         of_iounmap(&op->resource[3], info->enable_reg, 1);
 323         of_iounmap(&op->resource[2], info->freq_regs, 2);
 324
 325         dev_set_drvdata(&op->dev, NULL);
 326         kfree(state);
 327
 328         return 0;
 329 }
 330
 331 static const struct of_device_id grover_beep_match[] = {
 332         {
 333                 .name = "beep",
 334                 .compatible = "SUNW,smbus-beep",
 335         },
 336         {},
 337 };
 338
 339 static struct of_platform_driver grover_beep_driver = {
 340         .name           = "groverbeep",
 341         .match_table    = grover_beep_match,
 342         .probe          = grover_beep_probe,
 343         .remove         = __devexit_p(grover_remove),
 344         .shutdown       = sparcspkr_shutdown,
 345 };
 346
 347 static int __init sparcspkr_init(void)
 348 {
 349         int err = of_register_driver(&bbc_beep_driver,
 350                                      &of_platform_bus_type);
 351
 352         if (!err) {
 353                 err = of_register_driver(&grover_beep_driver,
 354                                          &of_platform_bus_type);
 355                 if (err)
 356                         of_unregister_driver(&bbc_beep_driver);
 357         }
 358
 359         return err;
 360 }
 361
 362 static void __exit sparcspkr_exit(void)
 363 {
 364         of_unregister_driver(&bbc_beep_driver);
 365         of_unregister_driver(&grover_beep_driver);
 366 }
 367
 368 module_init(sparcspkr_init);
 369 module_exit(sparcspkr_exit);