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