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         int ret, i;
 137         unsigned int val, idx = 0;
 138         unsigned int best_err = UINT_MAX;
 139
 140         ret = kstrtouint(buf, 10, &val);
 141         if (ret)
 142                 return ret;
 143
 144         for (i = 3; i >= 0; i--) {
 145                 unsigned int err;
 146
 147                 err = abs(time[i].time - val);
 148                 if (err < best_err) {
 149                         best_err = err;
 150                         idx = time[i].idx;
 151                 }
 152
 153                 if (!err)
 154                         break;
 155         }
 156
 157         idx <<= ffs(mask) - 1;
 158         ret = regmap_update_bits(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY,
 159                                  mask, idx);
 160         if (ret != 0)
 161                 return -EINVAL;
 162
 163         return count;
 164 }
 165
 166 static ssize_t axp20x_store_attr_startup(struct device *dev,
 167                                          struct device_attribute *attr,
 168                                          const char *buf, size_t count)
 169 {
 170         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
 171
 172         return axp20x_store_attr(dev, axp20x_pek->info->startup_time,
 173                                  axp20x_pek->info->startup_mask, buf, count);
 174 }
 175
 176 static ssize_t axp20x_store_attr_shutdown(struct device *dev,
 177                                           struct device_attribute *attr,
 178                                           const char *buf, size_t count)
 179 {
 180         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
 181
 182         return axp20x_store_attr(dev, axp20x_pek->info->shutdown_time,
 183                                  axp20x_pek->info->shutdown_mask, buf, count);
 184 }
 185
 186 static DEVICE_ATTR(startup, 0644, axp20x_show_attr_startup,
 187                    axp20x_store_attr_startup);
 188 static DEVICE_ATTR(shutdown, 0644, axp20x_show_attr_shutdown,
 189                    axp20x_store_attr_shutdown);
 190
 191 static struct attribute *axp20x_attrs[] = {
 192         &dev_attr_startup.attr,
 193         &dev_attr_shutdown.attr,
 194         NULL,
 195 };
 196 ATTRIBUTE_GROUPS(axp20x);
 197
 198 static irqreturn_t axp20x_pek_irq(int irq, void *pwr)
 199 {
 200         struct input_dev *idev = pwr;
 201         struct axp20x_pek *axp20x_pek = input_get_drvdata(idev);
 202
 203         /*
 204          * The power-button is connected to ground so a falling edge (dbf)
 205          * means it is pressed.
 206          */
 207         if (irq == axp20x_pek->irq_dbf)
 208                 input_report_key(idev, KEY_POWER, true);
 209         else if (irq == axp20x_pek->irq_dbr)
 210                 input_report_key(idev, KEY_POWER, false);
 211
 212         input_sync(idev);
 213
 214         return IRQ_HANDLED;
 215 }
 216
 217 static int axp20x_pek_probe_input_device(struct axp20x_pek *axp20x_pek,
 218                                          struct platform_device *pdev)
 219 {
 220         struct axp20x_dev *axp20x = axp20x_pek->axp20x;
 221         struct input_dev *idev;
 222         int error;
 223
 224         axp20x_pek->irq_dbr = platform_get_irq_byname(pdev, "PEK_DBR");
 225         if (axp20x_pek->irq_dbr < 0)
 226                 return axp20x_pek->irq_dbr;
 227         axp20x_pek->irq_dbr = regmap_irq_get_virq(axp20x->regmap_irqc,
 228                                                   axp20x_pek->irq_dbr);
 229
 230         axp20x_pek->irq_dbf = platform_get_irq_byname(pdev, "PEK_DBF");
 231         if (axp20x_pek->irq_dbf < 0)
 232                 return axp20x_pek->irq_dbf;
 233         axp20x_pek->irq_dbf = regmap_irq_get_virq(axp20x->regmap_irqc,
 234                                                   axp20x_pek->irq_dbf);
 235
 236         axp20x_pek->input = devm_input_allocate_device(&pdev->dev);
 237         if (!axp20x_pek->input)
 238                 return -ENOMEM;
 239
 240         idev = axp20x_pek->input;
 241
 242         idev->name = "axp20x-pek";
 243         idev->phys = "m1kbd/input2";
 244         idev->dev.parent = &pdev->dev;
 245
 246         input_set_capability(idev, EV_KEY, KEY_POWER);
 247
 248         input_set_drvdata(idev, axp20x_pek);
 249
 250         error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbr,
 251                                              axp20x_pek_irq, 0,
 252                                              "axp20x-pek-dbr", idev);
 253         if (error < 0) {
 254                 dev_err(&pdev->dev, "Failed to request dbr IRQ#%d: %d\n",
 255                         axp20x_pek->irq_dbr, error);
 256                 return error;
 257         }
 258
 259         error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbf,
 260                                           axp20x_pek_irq, 0,
 261                                           "axp20x-pek-dbf", idev);
 262         if (error < 0) {
 263                 dev_err(&pdev->dev, "Failed to request dbf IRQ#%d: %d\n",
 264                         axp20x_pek->irq_dbf, error);
 265                 return error;
 266         }
 267
 268         error = input_register_device(idev);
 269         if (error) {
 270                 dev_err(&pdev->dev, "Can't register input device: %d\n",
 271                         error);
 272                 return error;
 273         }
 274
 275         device_init_wakeup(&pdev->dev, true);
 276
 277         return 0;
 278 }
 279
 280 static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek)
 281 {
 282         if (IS_ENABLED(CONFIG_INPUT_SOC_BUTTON_ARRAY) &&
 283             axp20x_pek->axp20x->variant == AXP288_ID) {
 284                 /*
 285                  * On Cherry Trail platforms (hrv == 3), do not register the
 286                  * input device if there is an "INTCFD9" or "ACPI0011" gpio
 287                  * button ACPI device, as that handles the power button too,
 288                  * and otherwise we end up reporting all presses twice.
 289                  */
 290                 if (soc_intel_is_cht() &&
 291                                 (acpi_dev_present("INTCFD9", NULL, -1) ||
 292                                  acpi_dev_present("ACPI0011", NULL, -1)))
 293                         return false;
 294         }
 295
 296         return true;
 297 }
 298
 299 static int axp20x_pek_probe(struct platform_device *pdev)
 300 {
 301         struct axp20x_pek *axp20x_pek;
 302         const struct platform_device_id *match = platform_get_device_id(pdev);
 303         int error;
 304
 305         if (!match) {
 306                 dev_err(&pdev->dev, "Failed to get platform_device_id\n");
 307                 return -EINVAL;
 308         }
 309
 310         axp20x_pek = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_pek),
 311                                   GFP_KERNEL);
 312         if (!axp20x_pek)
 313                 return -ENOMEM;
 314
 315         axp20x_pek->axp20x = dev_get_drvdata(pdev->dev.parent);
 316
 317         if (axp20x_pek_should_register_input(axp20x_pek)) {
 318                 error = axp20x_pek_probe_input_device(axp20x_pek, pdev);
 319                 if (error)
 320                         return error;
 321         }
 322
 323         axp20x_pek->info = (struct axp20x_info *)match->driver_data;
 324
 325         platform_set_drvdata(pdev, axp20x_pek);
 326
 327         return 0;
 328 }
 329
 330 static int axp20x_pek_suspend(struct device *dev)
 331 {
 332         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
 333
 334         /*
 335          * As nested threaded IRQs are not automatically disabled during
 336          * suspend, we must explicitly disable non-wakeup IRQs.
 337          */
 338         if (device_may_wakeup(dev)) {
 339                 enable_irq_wake(axp20x_pek->irq_dbf);
 340                 enable_irq_wake(axp20x_pek->irq_dbr);
 341         } else {
 342                 disable_irq(axp20x_pek->irq_dbf);
 343                 disable_irq(axp20x_pek->irq_dbr);
 344         }
 345
 346         return 0;
 347 }
 348
 349 static int axp20x_pek_resume(struct device *dev)
 350 {
 351         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
 352
 353         if (device_may_wakeup(dev)) {
 354                 disable_irq_wake(axp20x_pek->irq_dbf);
 355                 disable_irq_wake(axp20x_pek->irq_dbr);
 356         } else {
 357                 enable_irq(axp20x_pek->irq_dbf);
 358                 enable_irq(axp20x_pek->irq_dbr);
 359         }
 360
 361         return 0;
 362 }
 363
 364 static int __maybe_unused axp20x_pek_resume_noirq(struct device *dev)
 365 {
 366         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
 367
 368         if (axp20x_pek->axp20x->variant != AXP288_ID)
 369                 return 0;
 370
 371         /*
 372          * Clear interrupts from button presses during suspend, to avoid
 373          * a wakeup power-button press getting reported to userspace.
 374          */
 375         regmap_write(axp20x_pek->axp20x->regmap,
 376                      AXP20X_IRQ1_STATE + AXP288_IRQ_POKN / 8,
 377                      BIT(AXP288_IRQ_POKN % 8));
 378
 379         return 0;
 380 }
 381
 382 static const struct dev_pm_ops axp20x_pek_pm_ops = {
 383         SYSTEM_SLEEP_PM_OPS(axp20x_pek_suspend, axp20x_pek_resume)
 384         .resume_noirq = pm_sleep_ptr(axp20x_pek_resume_noirq),
 385 };
 386
 387 static const struct platform_device_id axp_pek_id_match[] = {
 388         {
 389                 .name = "axp20x-pek",
 390                 .driver_data = (kernel_ulong_t)&axp20x_info,
 391         },
 392         {
 393                 .name = "axp221-pek",
 394                 .driver_data = (kernel_ulong_t)&axp221_info,
 395         },
 396         { /* sentinel */ }
 397 };
 398 MODULE_DEVICE_TABLE(platform, axp_pek_id_match);
 399
 400 static struct platform_driver axp20x_pek_driver = {
 401         .probe          = axp20x_pek_probe,
 402         .id_table       = axp_pek_id_match,
 403         .driver         = {
 404                 .name           = "axp20x-pek",
 405                 .pm             = pm_sleep_ptr(&axp20x_pek_pm_ops),
 406                 .dev_groups     = axp20x_groups,
 407         },
 408 };
 409 module_platform_driver(axp20x_pek_driver);
 410
 411 MODULE_DESCRIPTION("axp20x Power Button");
 412 MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
 413 MODULE_LICENSE("GPL");