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