drivers/input/keyboard/sprd_eic_keys.c

   1 /*
   2  * Copyright (C) 2014 Spreadtrum Communications Inc.
   3  *
   4  * This software is licensed under the terms of the GNU General Public
   5  * License version 2, as published by the Free Software Foundation, and
   6  * may be copied, distributed, and modified under those terms.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <linux/module.h>
  15
  16 #include <linux/init.h>
  17 #include <linux/fs.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/irq.h>
  20 #include <linux/sched.h>
  21 #include <linux/pm.h>
  22 #include <linux/slab.h>
  23 #include <linux/sysctl.h>
  24 #include <linux/proc_fs.h>
  25 #include <linux/delay.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/input.h>
  28 #include <linux/sprd_eic_keys.h>
  29 #include <linux/workqueue.h>
  30 #include <linux/gpio.h>
  31 #include <linux/of_platform.h>
  32 #include <linux/of_gpio.h>
  33 #include <linux/spinlock.h>
  34 #ifdef HOOK_POWER_KEY
  35 #include <linux/input-hook.h>
  36 #endif
  37 #if CONFIG_SEC_DEBUG
  38 #include <soc/sprd/sec_debug.h>
  39 #endif
  40
  41 //====================  debug  ====================
  42 #define ENTER \
  43 do{ if(debug_level >= 1) printk(KERN_INFO "[SPRD_EIC_KEYS_DBG] func: %s  line: %04d\n", __func__, __LINE__); }while(0)
  44
  45 #define PRINT_DBG(format,x...)  \
  46 do{ if(debug_level >= 1) printk(KERN_INFO "[SPRD_EIC_KEYS_DBG] " format, ## x); }while(0)
  47
  48 #define PRINT_INFO(format,x...)  \
  49 do{ printk(KERN_INFO "%s: " format, __func__, ## x); }while(0)
  50
  51 #define PRINT_WARN(format,x...)  \
  52 do{ printk(KERN_INFO "[SPRD_EIC_KEYS_WARN] " format, ## x); }while(0)
  53
  54 #define PRINT_ERR(format,x...)  \
  55 do{ printk(KERN_ERR "%s: " format, __func__, ## x); }while(0)
  56 //====================  debug  ====================
  57
  58 static int debug_level = 0;
  59 static struct sprd_eic_keys_platform_data *this_pdata = NULL;
  60 uint8_t vol_down_keys_pressed;
  61 static int sprd_eic_button_state(struct sprd_eic_keys_button *button)
  62 {
  63         int button_state = 0;
  64         int gpio_value = 0;
  65
  66         gpio_value = !!gpio_get_value(button->gpio);
  67
  68         if(1 == button->active_low) {
  69                 if(0 == gpio_value)
  70                         button_state = 1;
  71                 else
  72                         button_state = 0;
  73         } else {
  74                 if(1 == gpio_value)
  75                         button_state = 1;
  76                 else
  77                         button_state = 0;
  78         }
  79
  80         PRINT_DBG("GPIO_%d=%d, button_state=%d\n", button->gpio, gpio_value, button_state);
  81
  82         return button_state; //0==released, 1==pressed
  83 }
  84
  85 static irqreturn_t sprd_eic_irq_handle(int irq, void *dev_id)
  86 {
  87         struct sprd_eic_keys_button *button = (struct sprd_eic_keys_button *)dev_id;
  88         static int button_state_last = 0;
  89         int button_state_current = 0;
  90
  91         ENTER;
  92         disable_irq_nosync(button->irq);
  93         button_state_current = sprd_eic_button_state(button);
  94
  95         if (1 == button_state_current) {//pressed
  96 #ifdef HOOK_POWER_KEY
  97         #ifdef ( CONFIG_ARCH_SCX20 || CONFIG_ARCH_SCX35LT8 )
  98                 if(116 == button->code)
  99         #endif
 100                 input_report_key_hook(this_pdata->input_dev, button->code, button_state_current);
 101 #endif
 102                 input_report_key(this_pdata->input_dev, button->code, button_state_current);
 103                 input_sync(this_pdata->input_dev);
 104
 105                 if(1 == button->active_low)
 106                         irq_set_irq_type(button->irq, IRQF_TRIGGER_HIGH);
 107                 else
 108                         irq_set_irq_type(button->irq, IRQF_TRIGGER_LOW);
 109
 110         } else {//released
 111 #ifdef HOOK_POWER_KEY
 112         #ifdef ( CONFIG_ARCH_SCX20 || CONFIG_ARCH_SCX35LT8 )
 113                 if(116 == button->code)
 114         #endif
 115                 input_report_key_hook(this_pdata->input_dev, button->code, button_state_current);
 116 #endif
 117                 input_report_key(this_pdata->input_dev, button->code, button_state_current);
 118                 input_sync(this_pdata->input_dev);
 119
 120                 if(1 == button->active_low)
 121                         irq_set_irq_type(button->irq, IRQF_TRIGGER_LOW);
 122                 else
 123                         irq_set_irq_type(button->irq, IRQF_TRIGGER_HIGH);
 124
 125         }
 126         vol_down_keys_pressed = button_state_current;
 127 #if CONFIG_SEC_DEBUG
 128         if (KEY_VOLUMEDOWN == button->code)
 129                 sec_debug_check_crash_key(button->code, button_state_current);
 130 #endif
 131         button_state_last = button_state_current;
 132         enable_irq(button->irq);
 133         return IRQ_HANDLED;
 134 }
 135
 136 static int sprd_eic_keys_setup_key(struct sprd_eic_keys_button *button)
 137 {
 138         const char *desc = button->desc ? button->desc : "sprd_eic_keys";
 139         unsigned long irqflags = 0;
 140         int error = -1;
 141
 142         ENTER;
 143         if (gpio_is_valid(button->gpio)) {
 144
 145                 error = gpio_request_one(button->gpio, GPIOF_IN, desc);
 146                 if (error < 0) {
 147                         PRINT_ERR("Failed to request GPIO %d, error %d\n", button->gpio, error);
 148                         return error;
 149                 }
 150
 151                 if (button->debounce_interval) {
 152                         error = gpio_set_debounce(button->gpio, button->debounce_interval * 1000);
 153                         if (error < 0)
 154                                 PRINT_INFO("Failed to set debounce for GPIO %d\n", button->gpio);
 155                 }
 156
 157                 button->irq = gpio_to_irq(button->gpio);
 158                 if (button->irq < 0) {
 159                         error = button->irq;
 160                         PRINT_ERR("Unable to get irq number for GPIO %d, error %d\n", button->gpio, error);
 161                         goto fail;
 162                 }
 163         } else {
 164                 PRINT_ERR("No GPIO specified\n");
 165                 return -EINVAL;
 166         }
 167
 168         if (button->type && button->type != EV_KEY) {
 169                 PRINT_ERR("Only EV_KEY allowed for IRQ buttons\n");
 170                 return -EINVAL;
 171         }
 172
 173         input_set_capability(this_pdata->input_dev, button->type ?: EV_KEY, button->code);
 174
 175         irqflags = (1 == button->active_low) ? IRQF_TRIGGER_LOW : IRQF_TRIGGER_HIGH;
 176         irqflags |= IRQF_NO_SUSPEND;
 177
 178         error = request_any_context_irq(button->irq, sprd_eic_irq_handle, irqflags, desc, button);
 179         if (error < 0) {
 180                 PRINT_ERR("Unable to claim irq %d; error %d\n", button->irq, error);
 181                 goto fail;
 182         }
 183
 184         return 0;
 185
 186 fail:
 187         if (gpio_is_valid(button->gpio))
 188                 gpio_free(button->gpio);
 189
 190         return error;
 191 }
 192
 193 #ifdef CONFIG_OF
 194 static struct sprd_eic_keys_platform_data *sprd_eic_keys_get_devtree_pdata(struct device *dev)
 195 {
 196         struct device_node *node, *pp;
 197         struct sprd_eic_keys_platform_data *pdata;
 198         struct sprd_eic_keys_button *button;
 199         int error;
 200         int nbuttons;
 201         int i;
 202         char *input_name = NULL;
 203         int ret = -1;
 204
 205         node = dev->of_node;
 206         if (!node) {
 207                 error = -ENODEV;
 208                 goto err_out;
 209         }
 210
 211         nbuttons = of_get_child_count(node);
 212         if (nbuttons == 0) {
 213                 error = -ENODEV;
 214                 goto err_out;
 215         }
 216
 217         pdata = kzalloc(sizeof(*pdata) + nbuttons * (sizeof *button),
 218                         GFP_KERNEL);
 219         if (!pdata) {
 220                 error = -ENOMEM;
 221                 goto err_out;
 222         }
 223
 224         pdata->buttons = (struct sprd_eic_keys_button *)(pdata + 1);
 225         pdata->nbuttons = nbuttons;
 226
 227         pdata->rep = !!of_get_property(node, "autorepeat", NULL);
 228
 229         ret = of_property_read_string(node, "input-name", &input_name);
 230         if (0 == ret) {
 231                 pdata->name = input_name;
 232                 PRINT_INFO("input-name=\"%s\"\n", input_name);
 233         }
 234         else
 235                 PRINT_WARN("failed to get input-name\n");
 236
 237         i = 0;
 238         for_each_child_of_node(node, pp) {
 239                 int gpio;
 240                 enum of_gpio_flags flags;
 241
 242                 if (!of_find_property(pp, "gpios", NULL)) {
 243                         pdata->nbuttons--;
 244                         dev_warn(dev, "Found button without gpios\n");
 245                         continue;
 246                 }
 247
 248                 gpio = of_get_gpio_flags(pp, 0, &flags);
 249                 if (gpio < 0) {
 250                         error = gpio;
 251                         if (error != -EPROBE_DEFER)
 252                                 dev_err(dev,
 253                                         "Failed to get gpio flags, error: %d\n",
 254                                         error);
 255                         goto err_free_pdata;
 256                 }
 257
 258                 button = &pdata->buttons[i++];
 259
 260                 button->gpio = gpio;
 261                 button->active_low = flags & OF_GPIO_ACTIVE_LOW;
 262
 263                 if (of_property_read_u32(pp, "linux,code", &button->code)) {
 264                         dev_err(dev, "Button without keycode: 0x%x\n",
 265                                 button->gpio);
 266                         error = -EINVAL;
 267                         goto err_free_pdata;
 268                 }
 269
 270                 button->desc = of_get_property(pp, "label", NULL);
 271
 272                 if (of_property_read_u32(pp, "linux,input-type", &button->type))
 273                         button->type = EV_KEY;
 274
 275                 button->wakeup = !!of_get_property(pp, "gpio-key,wakeup", NULL);
 276
 277                 if (of_property_read_u32(pp, "debounce-interval",
 278                                          &button->debounce_interval))
 279                         button->debounce_interval = 5;
 280         }
 281
 282         if (pdata->nbuttons == 0) {
 283                 error = -EINVAL;
 284                 goto err_free_pdata;
 285         }
 286
 287         return pdata;
 288
 289 err_free_pdata:
 290         kfree(pdata);
 291 err_out:
 292         return ERR_PTR(error);
 293 }
 294
 295 static struct of_device_id sprd_eic_keys_of_match[] = {
 296         { .compatible = "sprd,sprd-eic-keys", },
 297         { },
 298 };
 299 MODULE_DEVICE_TABLE(of, sprd_eic_keys_of_match);
 300
 301 #else
 302
 303 static inline struct sprd_eic_keys_platform_data *sprd_eic_keys_get_devtree_pdata(struct device *dev)
 304 {
 305         return ERR_PTR(-ENODEV);
 306 }
 307
 308 #endif
 309 static ssize_t sprd_eic_button_show(struct kobject *kobj, struct kobj_attribute *attr, char *buff)
 310 {
 311         int status = 0;
 312
 313         status = sprd_eic_button_state(&this_pdata->buttons[0]);
 314         PRINT_INFO("button status = %d (0 == released, 1 == pressed)\n", status);
 315         return sprintf(buff, "%d\n", status);
 316 }
 317
 318 static struct kobject *sprd_eic_button_kobj = NULL;
 319 static struct kobj_attribute sprd_eic_button_attr =
 320         __ATTR(status, 0644, sprd_eic_button_show, NULL);
 321
 322 static int sprd_eic_button_sysfs_init(void)
 323 {
 324         int ret = -1;
 325
 326         sprd_eic_button_kobj = kobject_create_and_add("sprd_eic_button", kernel_kobj);
 327         if (sprd_eic_button_kobj == NULL) {
 328                 ret = -ENOMEM;
 329                 PRINT_ERR("register sysfs failed. ret = %d\n", ret);
 330                 return ret;
 331         }
 332
 333         ret = sysfs_create_file(sprd_eic_button_kobj, &sprd_eic_button_attr.attr);
 334         if (ret) {
 335                 PRINT_ERR("create sysfs failed. ret = %d\n", ret);
 336                 return ret;
 337         }
 338
 339         PRINT_INFO("sprd_eic_button_sysfs_init success\n");
 340         return ret;
 341 }
 342 static int sprd_eic_keys_probe(struct platform_device *pdev)
 343 {
 344         struct device *dev = &pdev->dev;
 345         struct sprd_eic_keys_button *button = NULL;
 346         struct input_dev *input = NULL;
 347         int i = 0;
 348         int error = -1;
 349
 350         ENTER;
 351         this_pdata = dev_get_platdata(dev);
 352
 353         if (!this_pdata) {
 354                 this_pdata = sprd_eic_keys_get_devtree_pdata(dev);
 355                 if (IS_ERR(this_pdata)) {
 356                         PRINT_ERR("failed to get platform data!\n");
 357                         return PTR_ERR(this_pdata);
 358                 }
 359         }
 360
 361         input = input_allocate_device();
 362         if (!input) {
 363                 PRINT_ERR("failed to allocate input device!\n");
 364                 error = -ENOMEM;
 365                 goto fail1;
 366         }
 367
 368         input->name = this_pdata->name ? this_pdata->name : pdev->name;
 369         input->id.bustype = BUS_HOST;
 370         this_pdata->input_dev = input;
 371
 372         if (this_pdata->rep)
 373                 __set_bit(EV_REP, input->evbit);
 374
 375         for (i = 0; i < this_pdata->nbuttons; i++) {
 376                 button = &this_pdata->buttons[i];
 377                 error = sprd_eic_keys_setup_key( button);
 378                 if (error)
 379                         goto fail2;
 380
 381                 if(KEY_POWER == button->code)
 382                         sprd_eic_button_sysfs_init();
 383         }
 384
 385         error = input_register_device(input);
 386         if (error) {
 387                 PRINT_ERR("Unable to register input device!\n");
 388                 goto fail3;
 389         }
 390         PRINT_INFO("probe success!\n");
 391         return 0;
 392
 393 fail3:
 394 fail2:
 395         while (--i >= 0) {
 396                 button = &this_pdata->buttons[i];
 397                 free_irq(button->irq, button);
 398                 if (gpio_is_valid(button->gpio)) {
 399                         gpio_free(button->gpio);
 400                 }
 401         }
 402
 403         input_free_device(input);
 404 fail1:
 405         PRINT_ERR("probe failed!\n");
 406         return error;
 407 }
 408
 409 #ifdef CONFIG_PM
 410 static int sprd_eic_keys_suspend(struct platform_device *dev, pm_message_t state)
 411 {
 412         return 0;
 413 }
 414
 415 static int sprd_eic_keys_resume(struct platform_device *dev)
 416 {
 417         return 0;
 418 }
 419 #else
 420 #define sprd_eic_keys_suspend NULL
 421 #define sprd_eic_keys_resume NULL
 422 #endif
 423
 424 static struct platform_driver sprd_eic_keys_device_driver = {
 425         .probe = sprd_eic_keys_probe,
 426         .suspend = NULL,
 427         .resume = NULL,
 428         .driver = {
 429                 .name = "sprd-eic-keys",
 430                 .owner = THIS_MODULE,
 431                 .of_match_table = of_match_ptr(sprd_eic_keys_of_match),
 432         }
 433 };
 434
 435 static int __init sprd_eic_keys_init(void)
 436 {
 437         ENTER;
 438 #ifdef HOOK_POWER_KEY
 439         input_hook_init();
 440 #endif
 441
 442 /***************************************************************/
 443         struct device_node *node = of_find_compatible_node(NULL, NULL, "sprd,sprd-eic-keys");
 444         if(node) {
 445                 PRINT_INFO("Find the node name:%s\n",node->name);
 446
 447                 struct platform_device *dev = of_find_device_by_node(node);
 448                 if(dev)
 449                         PRINT_INFO("Find the device name:%s\n",dev->name);
 450                 else
 451                         PRINT_INFO("Not Find the device\n");
 452         }
 453         else
 454                 PRINT_INFO("Not Find the node\n");
 455 /***************************************************************/
 456
 457         return platform_driver_register(&sprd_eic_keys_device_driver);
 458 }
 459
 460 static void __exit sprd_eic_keys_exit(void)
 461 {
 462 #ifdef HOOK_POWER_KEY
 463         input_hook_exit();
 464 #endif
 465         platform_driver_unregister(&sprd_eic_keys_device_driver);
 466 }
 467
 468 late_initcall(sprd_eic_keys_init);
 469 module_exit(sprd_eic_keys_exit);
 470
 471 MODULE_LICENSE("GPL");
 472 MODULE_AUTHOR("Yaochuan Li <yaochuan.li@spreadtrum.com>");
 473 MODULE_DESCRIPTION("Keyboard driver for spreadtrum eic keys");
 474 MODULE_ALIAS("platform:sprd-eic-keys");