1 // #define DEBUG 2 3 /* ToDo list (incomplete, unorderd) 4 - convert mouse, keyboard, and power to platform devices 5 */ 6 7 #include <asm/io.h> 8 #include <asm/irq.h> 9 #include <linux/completion.h> 10 #include <linux/interrupt.h> 11 #include <linux/irq.h> 12 #include <linux/slab.h> 13 #include <linux/gpio.h> 14 #include <linux/serio.h> 15 #include <linux/delay.h> 16 #include <linux/input.h> 17 #include <linux/workqueue.h> 18 #include <linux/clk.h> 19 #include <mach/iomap.h> 20 #include <mach/clk.h> 21 #include <linux/semaphore.h> 22 #include <linux/list.h> 23 #include <linux/notifier.h> 24 #include <linux/platform_device.h> 25 #include <linux/mfd/core.h> 26 #include "nvec.h" 27 28 static unsigned char EC_DISABLE_EVENT_REPORTING[] = {'\x04','\x00','\x00'}; 29 static unsigned char EC_ENABLE_EVENT_REPORTING[] = {'\x04','\x00','\x01'}; 30 static unsigned char EC_GET_FIRMWARE_VERSION[] = {'\x07','\x15'}; 31 32 static struct nvec_chip *nvec_power_handle; 33 34 static struct mfd_cell nvec_devices[] = { 35 { 36 .name = "nvec-kbd", 37 .id = 1, 38 }, 39 { 40 .name = "nvec-mouse", 41 .id = 1, 42 }, 43 { 44 .name = "nvec-power", 45 .id = 1, 46 }, 47 { 48 .name = "nvec-power", 49 .id = 2, 50 }, 51 }; 52 53 int nvec_register_notifier(struct nvec_chip *nvec, struct notifier_block *nb, 54 unsigned int events) 55 { 56 return atomic_notifier_chain_register(&nvec->notifier_list, nb); 57 } 58 EXPORT_SYMBOL_GPL(nvec_register_notifier); 59 60 static int nvec_status_notifier(struct notifier_block *nb, unsigned long event_type, 61 void *data) 62 { 63 unsigned char *msg = (unsigned char *)data; 64 int i; 65 66 if(event_type != NVEC_CNTL) 67 return NOTIFY_DONE; 68 69 printk("unhandled msg type %ld, payload: ", event_type); 70 for (i = 0; i < msg[1]; i++) 71 printk("%0x ", msg[i+2]); 72 printk("\n"); 73 74 return NOTIFY_OK; 75 } 76 77 void nvec_write_async(struct nvec_chip *nvec, unsigned char *data, short size) 78 { 79 struct nvec_msg *msg = kzalloc(sizeof(struct nvec_msg), GFP_NOWAIT); 80 81 msg->data = kzalloc(size, GFP_NOWAIT); 82 msg->data[0] = size; 83 memcpy(msg->data + 1, data, size); 84 msg->size = size + 1; 85 msg->pos = 0; 86 INIT_LIST_HEAD(&msg->node); 87 88 list_add_tail(&msg->node, &nvec->tx_data); 89 90 gpio_set_value(nvec->gpio, 0); 91 } 92 EXPORT_SYMBOL(nvec_write_async); 93 94 static void nvec_request_master(struct work_struct *work) 95 { 96 struct nvec_chip *nvec = container_of(work, struct nvec_chip, tx_work); 97 98 if(!list_empty(&nvec->tx_data)) { 99 gpio_set_value(nvec->gpio, 0); 100 } 101 } 102 103 static int parse_msg(struct nvec_chip *nvec, struct nvec_msg *msg) 104 { 105 int i; 106 107 if((msg->data[0] & 1<<7) == 0 && msg->data[3]) { 108 dev_err(nvec->dev, "ec responded %02x %02x %02x %02x\n", msg->data[0], 109 msg->data[1], msg->data[2], msg->data[3]); 110 return -EINVAL; 111 } 112 113 if ((msg->data[0] >> 7 ) == 1 && (msg->data[0] & 0x0f) == 5) 114 { 115 dev_warn(nvec->dev, "ec system event "); 116 for (i=0; i < msg->data[1]; i++) 117 dev_warn(nvec->dev, "%02x ", msg->data[2+i]); 118 dev_warn(nvec->dev, "\n"); 119 } 120 121 atomic_notifier_call_chain(&nvec->notifier_list, msg->data[0] & 0x8f, msg->data); 122 123 return 0; 124 } 125 126 static struct nvec_msg *nvec_write_sync(struct nvec_chip *nvec, unsigned char *data, short size) 127 { 128 down(&nvec->sync_write_mutex); 129 130 nvec->sync_write_pending = (data[1] << 8) + data[0]; 131 nvec_write_async(nvec, data, size); 132 133 dev_dbg(nvec->dev, "nvec_sync_write: 0x%04x\n", nvec->sync_write_pending); 134 wait_for_completion(&nvec->sync_write); 135 dev_dbg(nvec->dev, "nvec_sync_write: pong!\n"); 136 137 up(&nvec->sync_write_mutex); 138 139 return nvec->last_sync_msg; 140 } 141 142 /* RX worker */ 143 static void nvec_dispatch(struct work_struct *work) 144 { 145 struct nvec_chip *nvec = container_of(work, struct nvec_chip, rx_work); 146 struct nvec_msg *msg; 147 148 while(!list_empty(&nvec->rx_data)) 149 { 150 msg = list_first_entry(&nvec->rx_data, struct nvec_msg, node); 151 list_del_init(&msg->node); 152 153 if(nvec->sync_write_pending == (msg->data[2] << 8) + msg->data[0]) 154 { 155 dev_dbg(nvec->dev, "sync write completed!\n"); 156 nvec->sync_write_pending = 0; 157 nvec->last_sync_msg = msg; 158 complete(&nvec->sync_write); 159 } else { 160 parse_msg(nvec, msg); 161 if((!msg) || (!msg->data)) 162 dev_warn(nvec->dev, "attempt access zero pointer\n"); 163 else { 164 kfree(msg->data); 165 kfree(msg); 166 } 167 } 168 } 169 } 170 171 static irqreturn_t nvec_interrupt(int irq, void *dev) 172 { 173 unsigned long status; 174 unsigned long received; 175 unsigned char to_send; 176 struct nvec_msg *msg; 177 struct nvec_chip *nvec = (struct nvec_chip *)dev; 178 void __iomem *base = nvec->base; 179 180 status = readl(base + I2C_SL_STATUS); 181 182 if(!(status & I2C_SL_IRQ)) 183 { 184 dev_warn(nvec->dev, "nvec Spurious IRQ\n"); 185 //Yup, handled. ahum. 186 goto handled; 187 } 188 if(status & END_TRANS && !(status & RCVD)) 189 { 190 //Reenable IRQ only when even has been sent 191 //printk("Write sequence ended !\n"); 192 //parse_msg(nvec); 193 nvec->state = NVEC_WAIT; 194 if(nvec->rx->size > 1) 195 { 196 list_add_tail(&nvec->rx->node, &nvec->rx_data); 197 schedule_work(&nvec->rx_work); 198 } else { 199 kfree(nvec->rx->data); 200 kfree(nvec->rx); 201 } 202 return IRQ_HANDLED; 203 } else if(status & RNW) 204 { 205 // Work around for AP20 New Slave Hw Bug. Give 1us extra. 206 // nvec/smbus/nvec_i2c_transport.c in NV`s crap for reference 207 if(status & RCVD) 208 udelay(3); 209 210 if(status & RCVD) 211 { 212 nvec->state = NVEC_WRITE; 213 //Master wants something from us. New communication 214 // dev_dbg(nvec->dev, "New read comm!\n"); 215 } else { 216 //Master wants something from us from a communication we've already started 217 // dev_dbg(nvec->dev, "Read comm cont !\n"); 218 } 219 //if(msg_pos<msg_size) { 220 if(list_empty(&nvec->tx_data)) 221 { 222 dev_err(nvec->dev, "nvec empty tx - sending no-op\n"); 223 to_send = 0x8a; 224 nvec_write_async(nvec, "\x07\x02", 2); 225 // to_send = 0x01; 226 } else { 227 msg = list_first_entry(&nvec->tx_data, struct nvec_msg, node); 228 if(msg->pos < msg->size) { 229 to_send = msg->data[msg->pos]; 230 msg->pos++; 231 } else { 232 dev_err(nvec->dev, "nvec crap! %d\n", msg->size); 233 to_send = 0x01; 234 } 235 236 if(msg->pos >= msg->size) 237 { 238 list_del_init(&msg->node); 239 kfree(msg->data); 240 kfree(msg); 241 schedule_work(&nvec->tx_work); 242 nvec->state = NVEC_WAIT; 243 } 244 } 245 writel(to_send, base + I2C_SL_RCVD); 246 247 gpio_set_value(nvec->gpio, 1); 248 249 dev_dbg(nvec->dev, "nvec sent %x\n", to_send); 250 251 goto handled; 252 } else { 253 received = readl(base + I2C_SL_RCVD); 254 //Workaround? 255 if(status & RCVD) { 256 writel(0, base + I2C_SL_RCVD); 257 goto handled; 258 } 259 260 if (nvec->state == NVEC_WAIT) 261 { 262 nvec->state = NVEC_READ; 263 msg = kzalloc(sizeof(struct nvec_msg), GFP_NOWAIT); 264 msg->data = kzalloc(32, GFP_NOWAIT); 265 INIT_LIST_HEAD(&msg->node); 266 nvec->rx = msg; 267 } else 268 msg = nvec->rx; 269 270 BUG_ON(msg->pos > 32); 271 272 msg->data[msg->pos] = received; 273 msg->pos++; 274 msg->size = msg->pos; 275 dev_dbg(nvec->dev, "Got %02lx from Master (pos: %d)!\n", received, msg->pos); 276 } 277 handled: 278 return IRQ_HANDLED; 279 } 280 281 static void tegra_init_i2c_slave(struct nvec_chip *nvec) 282 { 283 u32 val; 284 285 clk_enable(nvec->i2c_clk); 286 287 tegra_periph_reset_assert(nvec->i2c_clk); 288 udelay(2); 289 tegra_periph_reset_deassert(nvec->i2c_clk); 290 291 writel(nvec->i2c_addr>>1, nvec->base + I2C_SL_ADDR1); 292 writel(0, nvec->base + I2C_SL_ADDR2); 293 294 writel(0x1E, nvec->base + I2C_SL_DELAY_COUNT); 295 val = I2C_CNFG_NEW_MASTER_SFM | I2C_CNFG_PACKET_MODE_EN | 296 (0x2 << I2C_CNFG_DEBOUNCE_CNT_SHIFT); 297 writel(val, nvec->base + I2C_CNFG); 298 writel(I2C_SL_NEWL, nvec->base + I2C_SL_CNFG); 299 300 clk_disable(nvec->i2c_clk); 301 } 302 303 static void nvec_power_off(void) 304 { 305 nvec_write_async(nvec_power_handle, EC_DISABLE_EVENT_REPORTING, 3); 306 nvec_write_async(nvec_power_handle, "\x04\x01", 2); 307 } 308 309 static int __devinit tegra_nvec_probe(struct platform_device *pdev) 310 { 311 int err, ret; 312 struct clk *i2c_clk; 313 struct nvec_platform_data *pdata = pdev->dev.platform_data; 314 struct nvec_chip *nvec; 315 struct nvec_msg *msg; 316 struct resource *res; 317 struct resource *iomem; 318 void __iomem *base; 319 320 nvec = kzalloc(sizeof(struct nvec_chip), GFP_KERNEL); 321 if(nvec == NULL) { 322 dev_err(&pdev->dev, "failed to reserve memory\n"); 323 return -ENOMEM; 324 } 325 platform_set_drvdata(pdev, nvec); 326 nvec->dev = &pdev->dev; 327 nvec->gpio = pdata->gpio; 328 nvec->i2c_addr = pdata->i2c_addr; 329 330 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 331 if (!res) { 332 dev_err(&pdev->dev, "no mem resource?\n"); 333 return -ENODEV; 334 } 335 336 iomem = request_mem_region(res->start, resource_size(res), pdev->name); 337 if (!iomem) { 338 dev_err(&pdev->dev, "I2C region already claimed\n"); 339 return -EBUSY; 340 } 341 342 base = ioremap(iomem->start, resource_size(iomem)); 343 if (!base) { 344 dev_err(&pdev->dev, "Can't ioremap I2C region\n"); 345 return -ENOMEM; 346 } 347 348 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 349 if (!res) { 350 dev_err(&pdev->dev, "no irq resource?\n"); 351 ret = -ENODEV; 352 goto err_iounmap; 353 } 354 355 i2c_clk = clk_get_sys("tegra-i2c.2", NULL); 356 if (IS_ERR(i2c_clk)) { 357 dev_err(nvec->dev, "failed to get controller clock\n"); 358 goto err_iounmap; 359 } 360 361 clk_enable(i2c_clk); 362 clk_set_rate(i2c_clk, 8*80000); 363 364 nvec->base = base; 365 nvec->irq = res->start; 366 nvec->i2c_clk = i2c_clk; 367 368 /* Set the gpio to low when we've got something to say */ 369 err = gpio_request(nvec->gpio, "nvec gpio"); 370 if(err < 0) 371 dev_err(nvec->dev, "couldn't request gpio\n"); 372 373 ATOMIC_INIT_NOTIFIER_HEAD(&nvec->notifier_list); 374 375 init_completion(&nvec->sync_write); 376 sema_init(&nvec->sync_write_mutex, 1); 377 INIT_LIST_HEAD(&nvec->tx_data); 378 INIT_LIST_HEAD(&nvec->rx_data); 379 INIT_WORK(&nvec->rx_work, nvec_dispatch); 380 INIT_WORK(&nvec->tx_work, nvec_request_master); 381 382 err = request_irq(nvec->irq, nvec_interrupt, 0, "nvec", nvec); 383 if (err) { 384 dev_err(nvec->dev, "couldn't request irq\n"); 385 goto failed; 386 } 387 388 tegra_init_i2c_slave(nvec); 389 390 gpio_direction_output(nvec->gpio, 1); 391 gpio_set_value(nvec->gpio, 1); 392 393 /* enable event reporting */ 394 nvec_write_async(nvec, EC_ENABLE_EVENT_REPORTING, 395 sizeof(EC_ENABLE_EVENT_REPORTING)); 396 397 nvec->nvec_status_notifier.notifier_call = nvec_status_notifier; 398 nvec_register_notifier(nvec, &nvec->nvec_status_notifier, 0); 399 400 nvec_power_handle = nvec; 401 pm_power_off = nvec_power_off; 402 403 /* Get Firmware Version */ 404 msg = nvec_write_sync(nvec, EC_GET_FIRMWARE_VERSION, 405 sizeof(EC_GET_FIRMWARE_VERSION)); 406 407 dev_warn(nvec->dev, "ec firmware version %02x.%02x.%02x / %02x\n", 408 msg->data[4], msg->data[5], msg->data[6], msg->data[7]); 409 410 kfree(msg->data); 411 kfree(msg); 412 413 ret = mfd_add_devices(nvec->dev, -1, nvec_devices, 414 ARRAY_SIZE(nvec_devices), base, 0); 415 if(ret) 416 dev_err(nvec->dev, "error adding subdevices\n"); 417 418 /* unmute speakers? */ 419 nvec_write_async(nvec, "\x0d\x10\x59\x94", 4); 420 421 /* enable lid switch event */ 422 nvec_write_async(nvec, "\x01\x01\x01\x00\x00\x02\x00", 7); 423 424 /* enable power button event */ 425 nvec_write_async(nvec, "\x01\x01\x01\x00\x00\x80\x00", 7); 426 427 return 0; 428 429 err_iounmap: 430 iounmap(base); 431 failed: 432 kfree(nvec); 433 return -ENOMEM; 434 } 435 436 static int __devexit tegra_nvec_remove(struct platform_device *pdev) 437 { 438 struct nvec_chip *nvec = platform_get_drvdata(pdev); 439 440 nvec_write_async(nvec, EC_DISABLE_EVENT_REPORTING, 3); 441 mfd_remove_devices(nvec->dev); 442 free_irq(nvec->irq, &nvec_interrupt); 443 iounmap(nvec->base); 444 gpio_free(nvec->gpio); 445 kfree(nvec); 446 447 return 0; 448 } 449 450 #ifdef CONFIG_PM 451 452 static int tegra_nvec_suspend(struct platform_device *pdev, pm_message_t state) 453 { 454 struct nvec_chip *nvec = platform_get_drvdata(pdev); 455 456 dev_dbg(nvec->dev, "suspending\n"); 457 nvec_write_async(nvec, EC_DISABLE_EVENT_REPORTING, 3); 458 nvec_write_async(nvec, "\x04\x02", 2); 459 460 return 0; 461 } 462 463 static int tegra_nvec_resume(struct platform_device *pdev) { 464 465 struct nvec_chip *nvec = platform_get_drvdata(pdev); 466 467 dev_dbg(nvec->dev, "resuming\n"); 468 tegra_init_i2c_slave(nvec); 469 nvec_write_async(nvec, EC_ENABLE_EVENT_REPORTING, 3); 470 471 return 0; 472 } 473 474 #else 475 #define tegra_nvec_suspend NULL 476 #define tegra_nvec_resume NULL 477 #endif 478 479 static struct platform_driver nvec_device_driver = 480 { 481 .probe = tegra_nvec_probe, 482 .remove = __devexit_p(tegra_nvec_remove), 483 .suspend = tegra_nvec_suspend, 484 .resume = tegra_nvec_resume, 485 .driver = { 486 .name = "nvec", 487 .owner = THIS_MODULE, 488 } 489 }; 490 491 static int __init tegra_nvec_init(void) 492 { 493 return platform_driver_register(&nvec_device_driver); 494 } 495 496 module_init(tegra_nvec_init); 497 MODULE_ALIAS("platform:nvec"); 498