drivers/input/keyboard/mtk-pmic-keys.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2017 MediaTek, Inc.
   4  *
   5  * Author: Chen Zhong <chen.zhong@mediatek.com>
   6  */
   7
   8 #include <linux/input.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/kernel.h>
  11 #include <linux/mfd/mt6323/registers.h>
  12 #include <linux/mfd/mt6331/registers.h>
  13 #include <linux/mfd/mt6357/registers.h>
  14 #include <linux/mfd/mt6358/registers.h>
  15 #include <linux/mfd/mt6397/core.h>
  16 #include <linux/mfd/mt6397/registers.h>
  17 #include <linux/module.h>
  18 #include <linux/of_device.h>
  19 #include <linux/of.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/regmap.h>
  22
  23 #define MTK_PMIC_RST_DU_MASK    GENMASK(9, 8)
  24 #define MTK_PMIC_PWRKEY_RST     BIT(6)
  25 #define MTK_PMIC_HOMEKEY_RST    BIT(5)
  26
  27 #define MTK_PMIC_MT6331_RST_DU_MASK     GENMASK(13, 12)
  28 #define MTK_PMIC_MT6331_PWRKEY_RST      BIT(9)
  29 #define MTK_PMIC_MT6331_HOMEKEY_RST     BIT(8)
  30
  31 #define MTK_PMIC_PWRKEY_INDEX   0
  32 #define MTK_PMIC_HOMEKEY_INDEX  1
  33 #define MTK_PMIC_MAX_KEY_COUNT  2
  34
  35 struct mtk_pmic_keys_regs {
  36         u32 deb_reg;
  37         u32 deb_mask;
  38         u32 intsel_reg;
  39         u32 intsel_mask;
  40         u32 rst_en_mask;
  41 };
  42
  43 #define MTK_PMIC_KEYS_REGS(_deb_reg, _deb_mask,         \
  44         _intsel_reg, _intsel_mask, _rst_mask)           \
  45 {                                                       \
  46         .deb_reg                = _deb_reg,             \
  47         .deb_mask               = _deb_mask,            \
  48         .intsel_reg             = _intsel_reg,          \
  49         .intsel_mask            = _intsel_mask,         \
  50         .rst_en_mask            = _rst_mask,            \
  51 }
  52
  53 struct mtk_pmic_regs {
  54         const struct mtk_pmic_keys_regs keys_regs[MTK_PMIC_MAX_KEY_COUNT];
  55         u32 pmic_rst_reg;
  56         u32 rst_lprst_mask; /* Long-press reset timeout bitmask */
  57 };
  58
  59 static const struct mtk_pmic_regs mt6397_regs = {
  60         .keys_regs[MTK_PMIC_PWRKEY_INDEX] =
  61                 MTK_PMIC_KEYS_REGS(MT6397_CHRSTATUS,
  62                 0x8, MT6397_INT_RSV, 0x10, MTK_PMIC_PWRKEY_RST),
  63         .keys_regs[MTK_PMIC_HOMEKEY_INDEX] =
  64                 MTK_PMIC_KEYS_REGS(MT6397_OCSTATUS2,
  65                 0x10, MT6397_INT_RSV, 0x8, MTK_PMIC_HOMEKEY_RST),
  66         .pmic_rst_reg = MT6397_TOP_RST_MISC,
  67         .rst_lprst_mask = MTK_PMIC_RST_DU_MASK,
  68 };
  69
  70 static const struct mtk_pmic_regs mt6323_regs = {
  71         .keys_regs[MTK_PMIC_PWRKEY_INDEX] =
  72                 MTK_PMIC_KEYS_REGS(MT6323_CHRSTATUS,
  73                 0x2, MT6323_INT_MISC_CON, 0x10, MTK_PMIC_PWRKEY_RST),
  74         .keys_regs[MTK_PMIC_HOMEKEY_INDEX] =
  75                 MTK_PMIC_KEYS_REGS(MT6323_CHRSTATUS,
  76                 0x4, MT6323_INT_MISC_CON, 0x8, MTK_PMIC_HOMEKEY_RST),
  77         .pmic_rst_reg = MT6323_TOP_RST_MISC,
  78         .rst_lprst_mask = MTK_PMIC_RST_DU_MASK,
  79 };
  80
  81 static const struct mtk_pmic_regs mt6331_regs = {
  82         .keys_regs[MTK_PMIC_PWRKEY_INDEX] =
  83                 MTK_PMIC_KEYS_REGS(MT6331_TOPSTATUS, 0x2,
  84                                    MT6331_INT_MISC_CON, 0x4,
  85                                    MTK_PMIC_MT6331_PWRKEY_RST),
  86         .keys_regs[MTK_PMIC_HOMEKEY_INDEX] =
  87                 MTK_PMIC_KEYS_REGS(MT6331_TOPSTATUS, 0x4,
  88                                    MT6331_INT_MISC_CON, 0x2,
  89                                    MTK_PMIC_MT6331_HOMEKEY_RST),
  90         .pmic_rst_reg = MT6331_TOP_RST_MISC,
  91         .rst_lprst_mask = MTK_PMIC_MT6331_RST_DU_MASK,
  92 };
  93
  94 static const struct mtk_pmic_regs mt6357_regs = {
  95         .keys_regs[MTK_PMIC_PWRKEY_INDEX] =
  96                 MTK_PMIC_KEYS_REGS(MT6357_TOPSTATUS,
  97                                    0x2, MT6357_PSC_TOP_INT_CON0, 0x5,
  98                                    MTK_PMIC_PWRKEY_RST),
  99         .keys_regs[MTK_PMIC_HOMEKEY_INDEX] =
 100                 MTK_PMIC_KEYS_REGS(MT6357_TOPSTATUS,
 101                                    0x8, MT6357_PSC_TOP_INT_CON0, 0xa,
 102                                    MTK_PMIC_HOMEKEY_INDEX),
 103         .pmic_rst_reg = MT6357_TOP_RST_MISC,
 104         .rst_lprst_mask = MTK_PMIC_RST_DU_MASK,
 105 };
 106
 107 static const struct mtk_pmic_regs mt6358_regs = {
 108         .keys_regs[MTK_PMIC_PWRKEY_INDEX] =
 109                 MTK_PMIC_KEYS_REGS(MT6358_TOPSTATUS,
 110                                    0x2, MT6358_PSC_TOP_INT_CON0, 0x5,
 111                                    MTK_PMIC_PWRKEY_RST),
 112         .keys_regs[MTK_PMIC_HOMEKEY_INDEX] =
 113                 MTK_PMIC_KEYS_REGS(MT6358_TOPSTATUS,
 114                                    0x8, MT6358_PSC_TOP_INT_CON0, 0xa,
 115                                    MTK_PMIC_HOMEKEY_RST),
 116         .pmic_rst_reg = MT6358_TOP_RST_MISC,
 117         .rst_lprst_mask = MTK_PMIC_RST_DU_MASK,
 118 };
 119
 120 struct mtk_pmic_keys_info {
 121         struct mtk_pmic_keys *keys;
 122         const struct mtk_pmic_keys_regs *regs;
 123         unsigned int keycode;
 124         int irq;
 125         int irq_r; /* optional: release irq if different */
 126         bool wakeup:1;
 127 };
 128
 129 struct mtk_pmic_keys {
 130         struct input_dev *input_dev;
 131         struct device *dev;
 132         struct regmap *regmap;
 133         struct mtk_pmic_keys_info keys[MTK_PMIC_MAX_KEY_COUNT];
 134 };
 135
 136 enum mtk_pmic_keys_lp_mode {
 137         LP_DISABLE,
 138         LP_ONEKEY,
 139         LP_TWOKEY,
 140 };
 141
 142 static void mtk_pmic_keys_lp_reset_setup(struct mtk_pmic_keys *keys,
 143                                          const struct mtk_pmic_regs *regs)
 144 {
 145         const struct mtk_pmic_keys_regs *kregs_home, *kregs_pwr;
 146         u32 long_press_mode, long_press_debounce;
 147         u32 value, mask;
 148         int error;
 149
 150         kregs_home = keys->keys[MTK_PMIC_HOMEKEY_INDEX].regs;
 151         kregs_pwr = keys->keys[MTK_PMIC_PWRKEY_INDEX].regs;
 152
 153         error = of_property_read_u32(keys->dev->of_node, "power-off-time-sec",
 154                                      &long_press_debounce);
 155         if (error)
 156                 long_press_debounce = 0;
 157
 158         mask = regs->rst_lprst_mask;
 159         value = long_press_debounce << (ffs(regs->rst_lprst_mask) - 1);
 160
 161         error  = of_property_read_u32(keys->dev->of_node,
 162                                       "mediatek,long-press-mode",
 163                                       &long_press_mode);
 164         if (error)
 165                 long_press_mode = LP_DISABLE;
 166
 167         switch (long_press_mode) {
 168         case LP_TWOKEY:
 169                 value |= kregs_home->rst_en_mask;
 170                 fallthrough;
 171
 172         case LP_ONEKEY:
 173                 value |= kregs_pwr->rst_en_mask;
 174                 fallthrough;
 175
 176         case LP_DISABLE:
 177                 mask |= kregs_home->rst_en_mask;
 178                 mask |= kregs_pwr->rst_en_mask;
 179                 break;
 180
 181         default:
 182                 break;
 183         }
 184
 185         regmap_update_bits(keys->regmap, regs->pmic_rst_reg, mask, value);
 186 }
 187
 188 static irqreturn_t mtk_pmic_keys_irq_handler_thread(int irq, void *data)
 189 {
 190         struct mtk_pmic_keys_info *info = data;
 191         u32 key_deb, pressed;
 192
 193         regmap_read(info->keys->regmap, info->regs->deb_reg, &key_deb);
 194
 195         key_deb &= info->regs->deb_mask;
 196
 197         pressed = !key_deb;
 198
 199         input_report_key(info->keys->input_dev, info->keycode, pressed);
 200         input_sync(info->keys->input_dev);
 201
 202         dev_dbg(info->keys->dev, "(%s) key =%d using PMIC\n",
 203                  pressed ? "pressed" : "released", info->keycode);
 204
 205         return IRQ_HANDLED;
 206 }
 207
 208 static int mtk_pmic_key_setup(struct mtk_pmic_keys *keys,
 209                 struct mtk_pmic_keys_info *info)
 210 {
 211         int ret;
 212
 213         info->keys = keys;
 214
 215         ret = regmap_update_bits(keys->regmap, info->regs->intsel_reg,
 216                                  info->regs->intsel_mask,
 217                                  info->regs->intsel_mask);
 218         if (ret < 0)
 219                 return ret;
 220
 221         ret = devm_request_threaded_irq(keys->dev, info->irq, NULL,
 222                                         mtk_pmic_keys_irq_handler_thread,
 223                                         IRQF_ONESHOT | IRQF_TRIGGER_HIGH,
 224                                         "mtk-pmic-keys", info);
 225         if (ret) {
 226                 dev_err(keys->dev, "Failed to request IRQ: %d: %d\n",
 227                         info->irq, ret);
 228                 return ret;
 229         }
 230
 231         if (info->irq_r > 0) {
 232                 ret = devm_request_threaded_irq(keys->dev, info->irq_r, NULL,
 233                                                 mtk_pmic_keys_irq_handler_thread,
 234                                                 IRQF_ONESHOT | IRQF_TRIGGER_HIGH,
 235                                                 "mtk-pmic-keys", info);
 236                 if (ret) {
 237                         dev_err(keys->dev, "Failed to request IRQ_r: %d: %d\n",
 238                                 info->irq, ret);
 239                         return ret;
 240                 }
 241         }
 242
 243         input_set_capability(keys->input_dev, EV_KEY, info->keycode);
 244
 245         return 0;
 246 }
 247
 248 static int mtk_pmic_keys_suspend(struct device *dev)
 249 {
 250         struct mtk_pmic_keys *keys = dev_get_drvdata(dev);
 251         int index;
 252
 253         for (index = 0; index < MTK_PMIC_MAX_KEY_COUNT; index++) {
 254                 if (keys->keys[index].wakeup) {
 255                         enable_irq_wake(keys->keys[index].irq);
 256                         if (keys->keys[index].irq_r > 0)
 257                                 enable_irq_wake(keys->keys[index].irq_r);
 258                 }
 259         }
 260
 261         return 0;
 262 }
 263
 264 static int mtk_pmic_keys_resume(struct device *dev)
 265 {
 266         struct mtk_pmic_keys *keys = dev_get_drvdata(dev);
 267         int index;
 268
 269         for (index = 0; index < MTK_PMIC_MAX_KEY_COUNT; index++) {
 270                 if (keys->keys[index].wakeup) {
 271                         disable_irq_wake(keys->keys[index].irq);
 272                         if (keys->keys[index].irq_r > 0)
 273                                 disable_irq_wake(keys->keys[index].irq_r);
 274                 }
 275         }
 276
 277         return 0;
 278 }
 279
 280 static DEFINE_SIMPLE_DEV_PM_OPS(mtk_pmic_keys_pm_ops, mtk_pmic_keys_suspend,
 281                                 mtk_pmic_keys_resume);
 282
 283 static const struct of_device_id of_mtk_pmic_keys_match_tbl[] = {
 284         {
 285                 .compatible = "mediatek,mt6397-keys",
 286                 .data = &mt6397_regs,
 287         }, {
 288                 .compatible = "mediatek,mt6323-keys",
 289                 .data = &mt6323_regs,
 290         }, {
 291                 .compatible = "mediatek,mt6331-keys",
 292                 .data = &mt6331_regs,
 293         }, {
 294                 .compatible = "mediatek,mt6357-keys",
 295                 .data = &mt6357_regs,
 296         }, {
 297                 .compatible = "mediatek,mt6358-keys",
 298                 .data = &mt6358_regs,
 299         }, {
 300                 /* sentinel */
 301         }
 302 };
 303 MODULE_DEVICE_TABLE(of, of_mtk_pmic_keys_match_tbl);
 304
 305 static int mtk_pmic_keys_probe(struct platform_device *pdev)
 306 {
 307         int error, index = 0;
 308         unsigned int keycount;
 309         struct mt6397_chip *pmic_chip = dev_get_drvdata(pdev->dev.parent);
 310         struct device_node *node = pdev->dev.of_node, *child;
 311         static const char *const irqnames[] = { "powerkey", "homekey" };
 312         static const char *const irqnames_r[] = { "powerkey_r", "homekey_r" };
 313         struct mtk_pmic_keys *keys;
 314         const struct mtk_pmic_regs *mtk_pmic_regs;
 315         struct input_dev *input_dev;
 316         const struct of_device_id *of_id =
 317                 of_match_device(of_mtk_pmic_keys_match_tbl, &pdev->dev);
 318
 319         keys = devm_kzalloc(&pdev->dev, sizeof(*keys), GFP_KERNEL);
 320         if (!keys)
 321                 return -ENOMEM;
 322
 323         keys->dev = &pdev->dev;
 324         keys->regmap = pmic_chip->regmap;
 325         mtk_pmic_regs = of_id->data;
 326
 327         keys->input_dev = input_dev = devm_input_allocate_device(keys->dev);
 328         if (!input_dev) {
 329                 dev_err(keys->dev, "input allocate device fail.\n");
 330                 return -ENOMEM;
 331         }
 332
 333         input_dev->name = "mtk-pmic-keys";
 334         input_dev->id.bustype = BUS_HOST;
 335         input_dev->id.vendor = 0x0001;
 336         input_dev->id.product = 0x0001;
 337         input_dev->id.version = 0x0001;
 338
 339         keycount = of_get_available_child_count(node);
 340         if (keycount > MTK_PMIC_MAX_KEY_COUNT ||
 341             keycount > ARRAY_SIZE(irqnames)) {
 342                 dev_err(keys->dev, "too many keys defined (%d)\n", keycount);
 343                 return -EINVAL;
 344         }
 345
 346         for_each_child_of_node(node, child) {
 347                 keys->keys[index].regs = &mtk_pmic_regs->keys_regs[index];
 348
 349                 keys->keys[index].irq =
 350                         platform_get_irq_byname(pdev, irqnames[index]);
 351                 if (keys->keys[index].irq < 0) {
 352                         of_node_put(child);
 353                         return keys->keys[index].irq;
 354                 }
 355
 356                 if (of_device_is_compatible(node, "mediatek,mt6358-keys")) {
 357                         keys->keys[index].irq_r = platform_get_irq_byname(pdev,
 358                                                                           irqnames_r[index]);
 359
 360                         if (keys->keys[index].irq_r < 0) {
 361                                 of_node_put(child);
 362                                 return keys->keys[index].irq_r;
 363                         }
 364                 }
 365
 366                 error = of_property_read_u32(child,
 367                         "linux,keycodes", &keys->keys[index].keycode);
 368                 if (error) {
 369                         dev_err(keys->dev,
 370                                 "failed to read key:%d linux,keycode property: %d\n",
 371                                 index, error);
 372                         of_node_put(child);
 373                         return error;
 374                 }
 375
 376                 if (of_property_read_bool(child, "wakeup-source"))
 377                         keys->keys[index].wakeup = true;
 378
 379                 error = mtk_pmic_key_setup(keys, &keys->keys[index]);
 380                 if (error) {
 381                         of_node_put(child);
 382                         return error;
 383                 }
 384
 385                 index++;
 386         }
 387
 388         error = input_register_device(input_dev);
 389         if (error) {
 390                 dev_err(&pdev->dev,
 391                         "register input device failed (%d)\n", error);
 392                 return error;
 393         }
 394
 395         mtk_pmic_keys_lp_reset_setup(keys, mtk_pmic_regs);
 396
 397         platform_set_drvdata(pdev, keys);
 398
 399         return 0;
 400 }
 401
 402 static struct platform_driver pmic_keys_pdrv = {
 403         .probe = mtk_pmic_keys_probe,
 404         .driver = {
 405                    .name = "mtk-pmic-keys",
 406                    .of_match_table = of_mtk_pmic_keys_match_tbl,
 407                    .pm = pm_sleep_ptr(&mtk_pmic_keys_pm_ops),
 408         },
 409 };
 410
 411 module_platform_driver(pmic_keys_pdrv);
 412
 413 MODULE_LICENSE("GPL v2");
 414 MODULE_AUTHOR("Chen Zhong <chen.zhong@mediatek.com>");
 415 MODULE_DESCRIPTION("MTK pmic-keys driver v0.1");