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 axp20x_pek *axp20x_pek = pwr;
 210         struct input_dev *idev = axp20x_pek->input;
 211
 212         if (!idev)
 213                 return IRQ_HANDLED;
 214
 215         /*
 216          * The power-button is connected to ground so a falling edge (dbf)
 217          * means it is pressed.
 218          */
 219         if (irq == axp20x_pek->irq_dbf)
 220                 input_report_key(idev, KEY_POWER, true);
 221         else if (irq == axp20x_pek->irq_dbr)
 222                 input_report_key(idev, KEY_POWER, false);
 223
 224         input_sync(idev);
 225
 226         return IRQ_HANDLED;
 227 }
 228
 229 static int axp20x_pek_probe_input_device(struct axp20x_pek *axp20x_pek,
 230                                          struct platform_device *pdev)
 231 {
 232         struct input_dev *idev;
 233         int error;
 234
 235         axp20x_pek->input = devm_input_allocate_device(&pdev->dev);
 236         if (!axp20x_pek->input)
 237                 return -ENOMEM;
 238
 239         idev = axp20x_pek->input;
 240
 241         idev->name = "axp20x-pek";
 242         idev->phys = "m1kbd/input2";
 243         idev->dev.parent = &pdev->dev;
 244
 245         input_set_capability(idev, EV_KEY, KEY_POWER);
 246
 247         input_set_drvdata(idev, axp20x_pek);
 248
 249         error = input_register_device(idev);
 250         if (error) {
 251                 dev_err(&pdev->dev, "Can't register input device: %d\n",
 252                         error);
 253                 return error;
 254         }
 255
 256         return 0;
 257 }
 258
 259 static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek)
 260 {
 261         if (IS_ENABLED(CONFIG_INPUT_SOC_BUTTON_ARRAY) &&
 262             axp20x_pek->axp20x->variant == AXP288_ID) {
 263                 /*
 264                  * On Cherry Trail platforms (hrv == 3), do not register the
 265                  * input device if there is an "INTCFD9" or "ACPI0011" gpio
 266                  * button ACPI device, as that handles the power button too,
 267                  * and otherwise we end up reporting all presses twice.
 268                  */
 269                 if (soc_intel_is_cht() &&
 270                                 (acpi_dev_present("INTCFD9", NULL, -1) ||
 271                                  acpi_dev_present("ACPI0011", NULL, -1)))
 272                         return false;
 273         }
 274
 275         return true;
 276 }
 277
 278 static int axp20x_pek_probe(struct platform_device *pdev)
 279 {
 280         struct axp20x_pek *axp20x_pek;
 281         const struct platform_device_id *match = platform_get_device_id(pdev);
 282         int error;
 283
 284         if (!match) {
 285                 dev_err(&pdev->dev, "Failed to get platform_device_id\n");
 286                 return -EINVAL;
 287         }
 288
 289         axp20x_pek = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_pek),
 290                                   GFP_KERNEL);
 291         if (!axp20x_pek)
 292                 return -ENOMEM;
 293
 294         axp20x_pek->axp20x = dev_get_drvdata(pdev->dev.parent);
 295
 296         axp20x_pek->irq_dbr = platform_get_irq_byname(pdev, "PEK_DBR");
 297         if (axp20x_pek->irq_dbr < 0)
 298                 return axp20x_pek->irq_dbr;
 299         axp20x_pek->irq_dbr = regmap_irq_get_virq(
 300                         axp20x_pek->axp20x->regmap_irqc, axp20x_pek->irq_dbr);
 301
 302         axp20x_pek->irq_dbf = platform_get_irq_byname(pdev, "PEK_DBF");
 303         if (axp20x_pek->irq_dbf < 0)
 304                 return axp20x_pek->irq_dbf;
 305         axp20x_pek->irq_dbf = regmap_irq_get_virq(
 306                         axp20x_pek->axp20x->regmap_irqc, axp20x_pek->irq_dbf);
 307
 308         if (axp20x_pek_should_register_input(axp20x_pek)) {
 309                 error = axp20x_pek_probe_input_device(axp20x_pek, pdev);
 310                 if (error)
 311                         return error;
 312         }
 313
 314         axp20x_pek->info = (struct axp20x_info *)match->driver_data;
 315
 316         error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbr,
 317                                              axp20x_pek_irq, 0,
 318                                              "axp20x-pek-dbr", axp20x_pek);
 319         if (error < 0) {
 320                 dev_err(&pdev->dev, "Failed to request dbr IRQ#%d: %d\n",
 321                         axp20x_pek->irq_dbr, error);
 322                 return error;
 323         }
 324
 325         error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbf,
 326                                           axp20x_pek_irq, 0,
 327                                           "axp20x-pek-dbf", axp20x_pek);
 328         if (error < 0) {
 329                 dev_err(&pdev->dev, "Failed to request dbf IRQ#%d: %d\n",
 330                         axp20x_pek->irq_dbf, error);
 331                 return error;
 332         }
 333
 334         device_init_wakeup(&pdev->dev, true);
 335
 336         platform_set_drvdata(pdev, axp20x_pek);
 337
 338         return 0;
 339 }
 340
 341 static int __maybe_unused axp20x_pek_suspend(struct device *dev)
 342 {
 343         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
 344
 345         /*
 346          * As nested threaded IRQs are not automatically disabled during
 347          * suspend, we must explicitly disable non-wakeup IRQs.
 348          */
 349         if (device_may_wakeup(dev)) {
 350                 enable_irq_wake(axp20x_pek->irq_dbf);
 351                 enable_irq_wake(axp20x_pek->irq_dbr);
 352         } else {
 353                 disable_irq(axp20x_pek->irq_dbf);
 354                 disable_irq(axp20x_pek->irq_dbr);
 355         }
 356
 357         return 0;
 358 }
 359
 360 static int __maybe_unused axp20x_pek_resume(struct device *dev)
 361 {
 362         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
 363
 364         if (device_may_wakeup(dev)) {
 365                 disable_irq_wake(axp20x_pek->irq_dbf);
 366                 disable_irq_wake(axp20x_pek->irq_dbr);
 367         } else {
 368                 enable_irq(axp20x_pek->irq_dbf);
 369                 enable_irq(axp20x_pek->irq_dbr);
 370         }
 371
 372         return 0;
 373 }
 374
 375 static int __maybe_unused axp20x_pek_resume_noirq(struct device *dev)
 376 {
 377         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
 378
 379         if (axp20x_pek->axp20x->variant != AXP288_ID)
 380                 return 0;
 381
 382         /*
 383          * Clear interrupts from button presses during suspend, to avoid
 384          * a wakeup power-button press getting reported to userspace.
 385          */
 386         regmap_write(axp20x_pek->axp20x->regmap,
 387                      AXP20X_IRQ1_STATE + AXP288_IRQ_POKN / 8,
 388                      BIT(AXP288_IRQ_POKN % 8));
 389
 390         return 0;
 391 }
 392
 393 static const struct dev_pm_ops axp20x_pek_pm_ops = {
 394         SET_SYSTEM_SLEEP_PM_OPS(axp20x_pek_suspend, axp20x_pek_resume)
 395 #ifdef CONFIG_PM_SLEEP
 396         .resume_noirq = axp20x_pek_resume_noirq,
 397 #endif
 398 };
 399
 400 static const struct platform_device_id axp_pek_id_match[] = {
 401         {
 402                 .name = "axp20x-pek",
 403                 .driver_data = (kernel_ulong_t)&axp20x_info,
 404         },
 405         {
 406                 .name = "axp221-pek",
 407                 .driver_data = (kernel_ulong_t)&axp221_info,
 408         },
 409         { /* sentinel */ }
 410 };
 411 MODULE_DEVICE_TABLE(platform, axp_pek_id_match);
 412
 413 static struct platform_driver axp20x_pek_driver = {
 414         .probe          = axp20x_pek_probe,
 415         .id_table       = axp_pek_id_match,
 416         .driver         = {
 417                 .name           = "axp20x-pek",
 418                 .pm             = &axp20x_pek_pm_ops,
 419                 .dev_groups     = axp20x_groups,
 420         },
 421 };
 422 module_platform_driver(axp20x_pek_driver);
 423
 424 MODULE_DESCRIPTION("axp20x Power Button");
 425 MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
 426 MODULE_LICENSE("GPL");