1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Driver for PC-speaker like devices found on various Sparc systems. 4 * 5 * Copyright (c) 2002 Vojtech Pavlik 6 * Copyright (c) 2002, 2006, 2008 David S. Miller (davem@davemloft.net) 7 */ 8 #include <linux/kernel.h> 9 #include <linux/module.h> 10 #include <linux/init.h> 11 #include <linux/input.h> 12 #include <linux/of_device.h> 13 #include <linux/slab.h> 14 15 #include <asm/io.h> 16 17 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>"); 18 MODULE_DESCRIPTION("Sparc Speaker beeper driver"); 19 MODULE_LICENSE("GPL"); 20 21 struct grover_beep_info { 22 void __iomem *freq_regs; 23 void __iomem *enable_reg; 24 }; 25 26 struct bbc_beep_info { 27 u32 clock_freq; 28 void __iomem *regs; 29 }; 30 31 struct sparcspkr_state { 32 const char *name; 33 int (*event)(struct input_dev *dev, unsigned int type, unsigned int code, int value); 34 spinlock_t lock; 35 struct input_dev *input_dev; 36 union { 37 struct grover_beep_info grover; 38 struct bbc_beep_info bbc; 39 } u; 40 }; 41 42 static u32 bbc_count_to_reg(struct bbc_beep_info *info, unsigned int count) 43 { 44 u32 val, clock_freq = info->clock_freq; 45 int i; 46 47 if (!count) 48 return 0; 49 50 if (count <= clock_freq >> 20) 51 return 1 << 18; 52 53 if (count >= clock_freq >> 12) 54 return 1 << 10; 55 56 val = 1 << 18; 57 for (i = 19; i >= 11; i--) { 58 val >>= 1; 59 if (count <= clock_freq >> i) 60 break; 61 } 62 63 return val; 64 } 65 66 static int bbc_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) 67 { 68 struct sparcspkr_state *state = dev_get_drvdata(dev->dev.parent); 69 struct bbc_beep_info *info = &state->u.bbc; 70 unsigned int count = 0; 71 unsigned long flags; 72 73 if (type != EV_SND) 74 return -1; 75 76 switch (code) { 77 case SND_BELL: if (value) value = 1000; 78 case SND_TONE: break; 79 default: return -1; 80 } 81 82 if (value > 20 && value < 32767) 83 count = 1193182 / value; 84 85 count = bbc_count_to_reg(info, count); 86 87 spin_lock_irqsave(&state->lock, flags); 88 89 if (count) { 90 sbus_writeb(0x01, info->regs + 0); 91 sbus_writeb(0x00, info->regs + 2); 92 sbus_writeb((count >> 16) & 0xff, info->regs + 3); 93 sbus_writeb((count >> 8) & 0xff, info->regs + 4); 94 sbus_writeb(0x00, info->regs + 5); 95 } else { 96 sbus_writeb(0x00, info->regs + 0); 97 } 98 99 spin_unlock_irqrestore(&state->lock, flags); 100 101 return 0; 102 } 103 104 static int grover_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) 105 { 106 struct sparcspkr_state *state = dev_get_drvdata(dev->dev.parent); 107 struct grover_beep_info *info = &state->u.grover; 108 unsigned int count = 0; 109 unsigned long flags; 110 111 if (type != EV_SND) 112 return -1; 113 114 switch (code) { 115 case SND_BELL: if (value) value = 1000; 116 case SND_TONE: break; 117 default: return -1; 118 } 119 120 if (value > 20 && value < 32767) 121 count = 1193182 / value; 122 123 spin_lock_irqsave(&state->lock, flags); 124 125 if (count) { 126 /* enable counter 2 */ 127 sbus_writeb(sbus_readb(info->enable_reg) | 3, info->enable_reg); 128 /* set command for counter 2, 2 byte write */ 129 sbus_writeb(0xB6, info->freq_regs + 1); 130 /* select desired HZ */ 131 sbus_writeb(count & 0xff, info->freq_regs + 0); 132 sbus_writeb((count >> 8) & 0xff, info->freq_regs + 0); 133 } else { 134 /* disable counter 2 */ 135 sbus_writeb(sbus_readb(info->enable_reg) & 0xFC, info->enable_reg); 136 } 137 138 spin_unlock_irqrestore(&state->lock, flags); 139 140 return 0; 141 } 142 143 static int sparcspkr_probe(struct device *dev) 144 { 145 struct sparcspkr_state *state = dev_get_drvdata(dev); 146 struct input_dev *input_dev; 147 int error; 148 149 input_dev = input_allocate_device(); 150 if (!input_dev) 151 return -ENOMEM; 152 153 input_dev->name = state->name; 154 input_dev->phys = "sparc/input0"; 155 input_dev->id.bustype = BUS_ISA; 156 input_dev->id.vendor = 0x001f; 157 input_dev->id.product = 0x0001; 158 input_dev->id.version = 0x0100; 159 input_dev->dev.parent = dev; 160 161 input_dev->evbit[0] = BIT_MASK(EV_SND); 162 input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE); 163 164 input_dev->event = state->event; 165 166 error = input_register_device(input_dev); 167 if (error) { 168 input_free_device(input_dev); 169 return error; 170 } 171 172 state->input_dev = input_dev; 173 174 return 0; 175 } 176 177 static void sparcspkr_shutdown(struct platform_device *dev) 178 { 179 struct sparcspkr_state *state = platform_get_drvdata(dev); 180 struct input_dev *input_dev = state->input_dev; 181 182 /* turn off the speaker */ 183 state->event(input_dev, EV_SND, SND_BELL, 0); 184 } 185 186 static int bbc_beep_probe(struct platform_device *op) 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 platform_set_drvdata(op, 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 of_iounmap(&op->resource[0], info->regs, 6); 225 226 out_free: 227 kfree(state); 228 out_err: 229 return err; 230 } 231 232 static int bbc_remove(struct platform_device *op) 233 { 234 struct sparcspkr_state *state = platform_get_drvdata(op); 235 struct input_dev *input_dev = state->input_dev; 236 struct bbc_beep_info *info = &state->u.bbc; 237 238 /* turn off the speaker */ 239 state->event(input_dev, EV_SND, SND_BELL, 0); 240 241 input_unregister_device(input_dev); 242 243 of_iounmap(&op->resource[0], info->regs, 6); 244 245 kfree(state); 246 247 return 0; 248 } 249 250 static const struct of_device_id bbc_beep_match[] = { 251 { 252 .name = "beep", 253 .compatible = "SUNW,bbc-beep", 254 }, 255 {}, 256 }; 257 MODULE_DEVICE_TABLE(of, bbc_beep_match); 258 259 static struct platform_driver bbc_beep_driver = { 260 .driver = { 261 .name = "bbcbeep", 262 .of_match_table = bbc_beep_match, 263 }, 264 .probe = bbc_beep_probe, 265 .remove = bbc_remove, 266 .shutdown = sparcspkr_shutdown, 267 }; 268 269 static int grover_beep_probe(struct platform_device *op) 270 { 271 struct sparcspkr_state *state; 272 struct grover_beep_info *info; 273 int err = -ENOMEM; 274 275 state = kzalloc(sizeof(*state), GFP_KERNEL); 276 if (!state) 277 goto out_err; 278 279 state->name = "Sparc Grover Speaker"; 280 state->event = grover_spkr_event; 281 spin_lock_init(&state->lock); 282 283 info = &state->u.grover; 284 info->freq_regs = of_ioremap(&op->resource[2], 0, 2, "grover beep freq"); 285 if (!info->freq_regs) 286 goto out_free; 287 288 info->enable_reg = of_ioremap(&op->resource[3], 0, 1, "grover beep enable"); 289 if (!info->enable_reg) 290 goto out_unmap_freq_regs; 291 292 platform_set_drvdata(op, state); 293 294 err = sparcspkr_probe(&op->dev); 295 if (err) 296 goto out_clear_drvdata; 297 298 return 0; 299 300 out_clear_drvdata: 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 grover_remove(struct platform_device *op) 312 { 313 struct sparcspkr_state *state = platform_get_drvdata(op); 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 kfree(state); 326 327 return 0; 328 } 329 330 static const struct of_device_id grover_beep_match[] = { 331 { 332 .name = "beep", 333 .compatible = "SUNW,smbus-beep", 334 }, 335 {}, 336 }; 337 MODULE_DEVICE_TABLE(of, grover_beep_match); 338 339 static struct platform_driver grover_beep_driver = { 340 .driver = { 341 .name = "groverbeep", 342 .of_match_table = grover_beep_match, 343 }, 344 .probe = grover_beep_probe, 345 .remove = grover_remove, 346 .shutdown = sparcspkr_shutdown, 347 }; 348 349 static struct platform_driver * const drivers[] = { 350 &bbc_beep_driver, 351 &grover_beep_driver, 352 }; 353 354 static int __init sparcspkr_init(void) 355 { 356 return platform_register_drivers(drivers, ARRAY_SIZE(drivers)); 357 } 358 359 static void __exit sparcspkr_exit(void) 360 { 361 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers)); 362 } 363 364 module_init(sparcspkr_init); 365 module_exit(sparcspkr_exit); 366