drivers/input/misc/axp20x-pek.c

   1 /*
   2  * axp20x power button driver.
   3  *
   4  * Copyright (C) 2013 Carlo Caione <carlo@caione.org>
   5  *
   6  * This file is subject to the terms and conditions of the GNU General
   7  * Public License. See the file "COPYING" in the main directory of this
   8  * archive for more details.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <linux/acpi.h>
  17 #include <linux/errno.h>
  18 #include <linux/irq.h>
  19 #include <linux/init.h>
  20 #include <linux/input.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/kernel.h>
  23 #include <linux/mfd/axp20x.h>
  24 #include <linux/module.h>
  25 #include <linux/platform_data/x86/soc.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/regmap.h>
  28 #include <linux/slab.h>
  29
  30 #define AXP20X_PEK_STARTUP_MASK         (0xc0)
  31 #define AXP20X_PEK_SHUTDOWN_MASK        (0x03)
  32
  33 struct axp20x_info {
  34         const struct axp20x_time *startup_time;
  35         unsigned int startup_mask;
  36         const struct axp20x_time *shutdown_time;
  37         unsigned int shutdown_mask;
  38 };
  39
  40 struct axp20x_pek {
  41         struct axp20x_dev *axp20x;
  42         struct input_dev *input;
  43         struct axp20x_info *info;
  44         int irq_dbr;
  45         int irq_dbf;
  46 };
  47
  48 struct axp20x_time {
  49         unsigned int time;
  50         unsigned int idx;
  51 };
  52
  53 static const struct axp20x_time startup_time[] = {
  54         { .time = 128,  .idx = 0 },
  55         { .time = 1000, .idx = 2 },
  56         { .time = 3000, .idx = 1 },
  57         { .time = 2000, .idx = 3 },
  58 };
  59
  60 static const struct axp20x_time axp221_startup_time[] = {
  61         { .time = 128,  .idx = 0 },
  62         { .time = 1000, .idx = 1 },
  63         { .time = 2000, .idx = 2 },
  64         { .time = 3000, .idx = 3 },
  65 };
  66
  67 static const struct axp20x_time shutdown_time[] = {
  68         { .time = 4000,  .idx = 0 },
  69         { .time = 6000,  .idx = 1 },
  70         { .time = 8000,  .idx = 2 },
  71         { .time = 10000, .idx = 3 },
  72 };
  73
  74 static const struct axp20x_info axp20x_info = {
  75         .startup_time = startup_time,
  76         .startup_mask = AXP20X_PEK_STARTUP_MASK,
  77         .shutdown_time = shutdown_time,
  78         .shutdown_mask = AXP20X_PEK_SHUTDOWN_MASK,
  79 };
  80
  81 static const struct axp20x_info axp221_info = {
  82         .startup_time = axp221_startup_time,
  83         .startup_mask = AXP20X_PEK_STARTUP_MASK,
  84         .shutdown_time = shutdown_time,
  85         .shutdown_mask = AXP20X_PEK_SHUTDOWN_MASK,
  86 };
  87
  88 static ssize_t axp20x_show_attr(struct device *dev,
  89                                 const struct axp20x_time *time,
  90                                 unsigned int mask, char *buf)
  91 {
  92         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
  93         unsigned int val;
  94         int ret, i;
  95
  96         ret = regmap_read(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY, &val);
  97         if (ret != 0)
  98                 return ret;
  99
 100         val &= mask;
 101         val >>= ffs(mask) - 1;
 102
 103         for (i = 0; i < 4; i++)
 104                 if (val == time[i].idx)
 105                         val = time[i].time;
 106
 107         return sprintf(buf, "%u\n", val);
 108 }
 109
 110 static ssize_t axp20x_show_attr_startup(struct device *dev,
 111                                         struct device_attribute *attr,
 112                                         char *buf)
 113 {
 114         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
 115
 116         return axp20x_show_attr(dev, axp20x_pek->info->startup_time,
 117                                 axp20x_pek->info->startup_mask, buf);
 118 }
 119
 120 static ssize_t axp20x_show_attr_shutdown(struct device *dev,
 121                                          struct device_attribute *attr,
 122                                          char *buf)
 123 {
 124         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
 125
 126         return axp20x_show_attr(dev, axp20x_pek->info->shutdown_time,
 127                                 axp20x_pek->info->shutdown_mask, buf);
 128 }
 129
 130 static ssize_t axp20x_store_attr(struct device *dev,
 131                                  const struct axp20x_time *time,
 132                                  unsigned int mask, const char *buf,
 133                                  size_t count)
 134 {
 135         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
 136         char val_str[20];
 137         size_t len;
 138         int ret, i;
 139         unsigned int val, idx = 0;
 140         unsigned int best_err = UINT_MAX;
 141
 142         val_str[sizeof(val_str) - 1] = '\0';
 143         strncpy(val_str, buf, sizeof(val_str) - 1);
 144         len = strlen(val_str);
 145
 146         if (len && val_str[len - 1] == '\n')
 147                 val_str[len - 1] = '\0';
 148
 149         ret = kstrtouint(val_str, 10, &val);
 150         if (ret)
 151                 return ret;
 152
 153         for (i = 3; i >= 0; i--) {
 154                 unsigned int err;
 155
 156                 err = abs(time[i].time - val);
 157                 if (err < best_err) {
 158                         best_err = err;
 159                         idx = time[i].idx;
 160                 }
 161
 162                 if (!err)
 163                         break;
 164         }
 165
 166         idx <<= ffs(mask) - 1;
 167         ret = regmap_update_bits(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY,
 168                                  mask, idx);
 169         if (ret != 0)
 170                 return -EINVAL;
 171
 172         return count;
 173 }
 174
 175 static ssize_t axp20x_store_attr_startup(struct device *dev,
 176                                          struct device_attribute *attr,
 177                                          const char *buf, size_t count)
 178 {
 179         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
 180
 181         return axp20x_store_attr(dev, axp20x_pek->info->startup_time,
 182                                  axp20x_pek->info->startup_mask, buf, count);
 183 }
 184
 185 static ssize_t axp20x_store_attr_shutdown(struct device *dev,
 186                                           struct device_attribute *attr,
 187                                           const char *buf, size_t count)
 188 {
 189         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
 190
 191         return axp20x_store_attr(dev, axp20x_pek->info->shutdown_time,
 192                                  axp20x_pek->info->shutdown_mask, buf, count);
 193 }
 194
 195 static DEVICE_ATTR(startup, 0644, axp20x_show_attr_startup,
 196                    axp20x_store_attr_startup);
 197 static DEVICE_ATTR(shutdown, 0644, axp20x_show_attr_shutdown,
 198                    axp20x_store_attr_shutdown);
 199
 200 static struct attribute *axp20x_attrs[] = {
 201         &dev_attr_startup.attr,
 202         &dev_attr_shutdown.attr,
 203         NULL,
 204 };
 205 ATTRIBUTE_GROUPS(axp20x);
 206
 207 static irqreturn_t axp20x_pek_irq(int irq, void *pwr)
 208 {
 209         struct input_dev *idev = pwr;
 210         struct axp20x_pek *axp20x_pek = input_get_drvdata(idev);
 211
 212         /*
 213          * The power-button is connected to ground so a falling edge (dbf)
 214          * means it is pressed.
 215          */
 216         if (irq == axp20x_pek->irq_dbf)
 217                 input_report_key(idev, KEY_POWER, true);
 218         else if (irq == axp20x_pek->irq_dbr)
 219                 input_report_key(idev, KEY_POWER, false);
 220
 221         input_sync(idev);
 222
 223         return IRQ_HANDLED;
 224 }
 225
 226 static int axp20x_pek_probe_input_device(struct axp20x_pek *axp20x_pek,
 227                                          struct platform_device *pdev)
 228 {
 229         struct axp20x_dev *axp20x = axp20x_pek->axp20x;
 230         struct input_dev *idev;
 231         int error;
 232
 233         axp20x_pek->irq_dbr = platform_get_irq_byname(pdev, "PEK_DBR");
 234         if (axp20x_pek->irq_dbr < 0)
 235                 return axp20x_pek->irq_dbr;
 236         axp20x_pek->irq_dbr = regmap_irq_get_virq(axp20x->regmap_irqc,
 237                                                   axp20x_pek->irq_dbr);
 238
 239         axp20x_pek->irq_dbf = platform_get_irq_byname(pdev, "PEK_DBF");
 240         if (axp20x_pek->irq_dbf < 0)
 241                 return axp20x_pek->irq_dbf;
 242         axp20x_pek->irq_dbf = regmap_irq_get_virq(axp20x->regmap_irqc,
 243                                                   axp20x_pek->irq_dbf);
 244
 245         axp20x_pek->input = devm_input_allocate_device(&pdev->dev);
 246         if (!axp20x_pek->input)
 247                 return -ENOMEM;
 248
 249         idev = axp20x_pek->input;
 250
 251         idev->name = "axp20x-pek";
 252         idev->phys = "m1kbd/input2";
 253         idev->dev.parent = &pdev->dev;
 254
 255         input_set_capability(idev, EV_KEY, KEY_POWER);
 256
 257         input_set_drvdata(idev, axp20x_pek);
 258
 259         error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbr,
 260                                              axp20x_pek_irq, 0,
 261                                              "axp20x-pek-dbr", idev);
 262         if (error < 0) {
 263                 dev_err(&pdev->dev, "Failed to request dbr IRQ#%d: %d\n",
 264                         axp20x_pek->irq_dbr, error);
 265                 return error;
 266         }
 267
 268         error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbf,
 269                                           axp20x_pek_irq, 0,
 270                                           "axp20x-pek-dbf", idev);
 271         if (error < 0) {
 272                 dev_err(&pdev->dev, "Failed to request dbf IRQ#%d: %d\n",
 273                         axp20x_pek->irq_dbf, error);
 274                 return error;
 275         }
 276
 277         error = input_register_device(idev);
 278         if (error) {
 279                 dev_err(&pdev->dev, "Can't register input device: %d\n",
 280                         error);
 281                 return error;
 282         }
 283
 284         device_init_wakeup(&pdev->dev, true);
 285
 286         return 0;
 287 }
 288
 289 static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek)
 290 {
 291         if (IS_ENABLED(CONFIG_INPUT_SOC_BUTTON_ARRAY) &&
 292             axp20x_pek->axp20x->variant == AXP288_ID) {
 293                 /*
 294                  * On Cherry Trail platforms (hrv == 3), do not register the
 295                  * input device if there is an "INTCFD9" or "ACPI0011" gpio
 296                  * button ACPI device, as that handles the power button too,
 297                  * and otherwise we end up reporting all presses twice.
 298                  */
 299                 if (soc_intel_is_cht() &&
 300                                 (acpi_dev_present("INTCFD9", NULL, -1) ||
 301                                  acpi_dev_present("ACPI0011", NULL, -1)))
 302                         return false;
 303         }
 304
 305         return true;
 306 }
 307
 308 static int axp20x_pek_probe(struct platform_device *pdev)
 309 {
 310         struct axp20x_pek *axp20x_pek;
 311         const struct platform_device_id *match = platform_get_device_id(pdev);
 312         int error;
 313
 314         if (!match) {
 315                 dev_err(&pdev->dev, "Failed to get platform_device_id\n");
 316                 return -EINVAL;
 317         }
 318
 319         axp20x_pek = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_pek),
 320                                   GFP_KERNEL);
 321         if (!axp20x_pek)
 322                 return -ENOMEM;
 323
 324         axp20x_pek->axp20x = dev_get_drvdata(pdev->dev.parent);
 325
 326         if (axp20x_pek_should_register_input(axp20x_pek)) {
 327                 error = axp20x_pek_probe_input_device(axp20x_pek, pdev);
 328                 if (error)
 329                         return error;
 330         }
 331
 332         axp20x_pek->info = (struct axp20x_info *)match->driver_data;
 333
 334         platform_set_drvdata(pdev, axp20x_pek);
 335
 336         return 0;
 337 }
 338
 339 static int __maybe_unused axp20x_pek_suspend(struct device *dev)
 340 {
 341         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
 342
 343         /*
 344          * As nested threaded IRQs are not automatically disabled during
 345          * suspend, we must explicitly disable non-wakeup IRQs.
 346          */
 347         if (device_may_wakeup(dev)) {
 348                 enable_irq_wake(axp20x_pek->irq_dbf);
 349                 enable_irq_wake(axp20x_pek->irq_dbr);
 350         } else {
 351                 disable_irq(axp20x_pek->irq_dbf);
 352                 disable_irq(axp20x_pek->irq_dbr);
 353         }
 354
 355         return 0;
 356 }
 357
 358 static int __maybe_unused axp20x_pek_resume(struct device *dev)
 359 {
 360         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
 361
 362         if (device_may_wakeup(dev)) {
 363                 disable_irq_wake(axp20x_pek->irq_dbf);
 364                 disable_irq_wake(axp20x_pek->irq_dbr);
 365         } else {
 366                 enable_irq(axp20x_pek->irq_dbf);
 367                 enable_irq(axp20x_pek->irq_dbr);
 368         }
 369
 370         return 0;
 371 }
 372
 373 static int __maybe_unused axp20x_pek_resume_noirq(struct device *dev)
 374 {
 375         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
 376
 377         if (axp20x_pek->axp20x->variant != AXP288_ID)
 378                 return 0;
 379
 380         /*
 381          * Clear interrupts from button presses during suspend, to avoid
 382          * a wakeup power-button press getting reported to userspace.
 383          */
 384         regmap_write(axp20x_pek->axp20x->regmap,
 385                      AXP20X_IRQ1_STATE + AXP288_IRQ_POKN / 8,
 386                      BIT(AXP288_IRQ_POKN % 8));
 387
 388         return 0;
 389 }
 390
 391 static const struct dev_pm_ops axp20x_pek_pm_ops = {
 392         SET_SYSTEM_SLEEP_PM_OPS(axp20x_pek_suspend, axp20x_pek_resume)
 393 #ifdef CONFIG_PM_SLEEP
 394         .resume_noirq = axp20x_pek_resume_noirq,
 395 #endif
 396 };
 397
 398 static const struct platform_device_id axp_pek_id_match[] = {
 399         {
 400                 .name = "axp20x-pek",
 401                 .driver_data = (kernel_ulong_t)&axp20x_info,
 402         },
 403         {
 404                 .name = "axp221-pek",
 405                 .driver_data = (kernel_ulong_t)&axp221_info,
 406         },
 407         { /* sentinel */ }
 408 };
 409 MODULE_DEVICE_TABLE(platform, axp_pek_id_match);
 410
 411 static struct platform_driver axp20x_pek_driver = {
 412         .probe          = axp20x_pek_probe,
 413         .id_table       = axp_pek_id_match,
 414         .driver         = {
 415                 .name           = "axp20x-pek",
 416                 .pm             = &axp20x_pek_pm_ops,
 417                 .dev_groups     = axp20x_groups,
 418         },
 419 };
 420 module_platform_driver(axp20x_pek_driver);
 421
 422 MODULE_DESCRIPTION("axp20x Power Button");
 423 MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
 424 MODULE_LICENSE("GPL");