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/mt6397/core.h>
  13 #include <linux/mfd/mt6397/registers.h>
  14 #include <linux/module.h>
  15 #include <linux/of_device.h>
  16 #include <linux/of.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/regmap.h>
  19
  20 #define MTK_PMIC_PWRKEY_RST_EN_MASK     0x1
  21 #define MTK_PMIC_PWRKEY_RST_EN_SHIFT    6
  22 #define MTK_PMIC_HOMEKEY_RST_EN_MASK    0x1
  23 #define MTK_PMIC_HOMEKEY_RST_EN_SHIFT   5
  24 #define MTK_PMIC_RST_DU_MASK            0x3
  25 #define MTK_PMIC_RST_DU_SHIFT           8
  26
  27 #define MTK_PMIC_PWRKEY_RST             \
  28         (MTK_PMIC_PWRKEY_RST_EN_MASK << MTK_PMIC_PWRKEY_RST_EN_SHIFT)
  29 #define MTK_PMIC_HOMEKEY_RST            \
  30         (MTK_PMIC_HOMEKEY_RST_EN_MASK << MTK_PMIC_HOMEKEY_RST_EN_SHIFT)
  31
  32 #define MTK_PMIC_PWRKEY_INDEX   0
  33 #define MTK_PMIC_HOMEKEY_INDEX  1
  34 #define MTK_PMIC_MAX_KEY_COUNT  2
  35
  36 struct mtk_pmic_keys_regs {
  37         u32 deb_reg;
  38         u32 deb_mask;
  39         u32 intsel_reg;
  40         u32 intsel_mask;
  41 };
  42
  43 #define MTK_PMIC_KEYS_REGS(_deb_reg, _deb_mask,         \
  44         _intsel_reg, _intsel_mask)                      \
  45 {                                                       \
  46         .deb_reg                = _deb_reg,             \
  47         .deb_mask               = _deb_mask,            \
  48         .intsel_reg             = _intsel_reg,          \
  49         .intsel_mask            = _intsel_mask,         \
  50 }
  51
  52 struct mtk_pmic_regs {
  53         const struct mtk_pmic_keys_regs keys_regs[MTK_PMIC_MAX_KEY_COUNT];
  54         u32 pmic_rst_reg;
  55 };
  56
  57 static const struct mtk_pmic_regs mt6397_regs = {
  58         .keys_regs[MTK_PMIC_PWRKEY_INDEX] =
  59                 MTK_PMIC_KEYS_REGS(MT6397_CHRSTATUS,
  60                 0x8, MT6397_INT_RSV, 0x10),
  61         .keys_regs[MTK_PMIC_HOMEKEY_INDEX] =
  62                 MTK_PMIC_KEYS_REGS(MT6397_OCSTATUS2,
  63                 0x10, MT6397_INT_RSV, 0x8),
  64         .pmic_rst_reg = MT6397_TOP_RST_MISC,
  65 };
  66
  67 static const struct mtk_pmic_regs mt6323_regs = {
  68         .keys_regs[MTK_PMIC_PWRKEY_INDEX] =
  69                 MTK_PMIC_KEYS_REGS(MT6323_CHRSTATUS,
  70                 0x2, MT6323_INT_MISC_CON, 0x10),
  71         .keys_regs[MTK_PMIC_HOMEKEY_INDEX] =
  72                 MTK_PMIC_KEYS_REGS(MT6323_CHRSTATUS,
  73                 0x4, MT6323_INT_MISC_CON, 0x8),
  74         .pmic_rst_reg = MT6323_TOP_RST_MISC,
  75 };
  76
  77 struct mtk_pmic_keys_info {
  78         struct mtk_pmic_keys *keys;
  79         const struct mtk_pmic_keys_regs *regs;
  80         unsigned int keycode;
  81         int irq;
  82         bool wakeup:1;
  83 };
  84
  85 struct mtk_pmic_keys {
  86         struct input_dev *input_dev;
  87         struct device *dev;
  88         struct regmap *regmap;
  89         struct mtk_pmic_keys_info keys[MTK_PMIC_MAX_KEY_COUNT];
  90 };
  91
  92 enum mtk_pmic_keys_lp_mode {
  93         LP_DISABLE,
  94         LP_ONEKEY,
  95         LP_TWOKEY,
  96 };
  97
  98 static void mtk_pmic_keys_lp_reset_setup(struct mtk_pmic_keys *keys,
  99                 u32 pmic_rst_reg)
 100 {
 101         int ret;
 102         u32 long_press_mode, long_press_debounce;
 103
 104         ret = of_property_read_u32(keys->dev->of_node,
 105                 "power-off-time-sec", &long_press_debounce);
 106         if (ret)
 107                 long_press_debounce = 0;
 108
 109         regmap_update_bits(keys->regmap, pmic_rst_reg,
 110                            MTK_PMIC_RST_DU_MASK << MTK_PMIC_RST_DU_SHIFT,
 111                            long_press_debounce << MTK_PMIC_RST_DU_SHIFT);
 112
 113         ret = of_property_read_u32(keys->dev->of_node,
 114                 "mediatek,long-press-mode", &long_press_mode);
 115         if (ret)
 116                 long_press_mode = LP_DISABLE;
 117
 118         switch (long_press_mode) {
 119         case LP_ONEKEY:
 120                 regmap_update_bits(keys->regmap, pmic_rst_reg,
 121                                    MTK_PMIC_PWRKEY_RST,
 122                                    MTK_PMIC_PWRKEY_RST);
 123                 regmap_update_bits(keys->regmap, pmic_rst_reg,
 124                                    MTK_PMIC_HOMEKEY_RST,
 125                                    0);
 126                 break;
 127         case LP_TWOKEY:
 128                 regmap_update_bits(keys->regmap, pmic_rst_reg,
 129                                    MTK_PMIC_PWRKEY_RST,
 130                                    MTK_PMIC_PWRKEY_RST);
 131                 regmap_update_bits(keys->regmap, pmic_rst_reg,
 132                                    MTK_PMIC_HOMEKEY_RST,
 133                                    MTK_PMIC_HOMEKEY_RST);
 134                 break;
 135         case LP_DISABLE:
 136                 regmap_update_bits(keys->regmap, pmic_rst_reg,
 137                                    MTK_PMIC_PWRKEY_RST,
 138                                    0);
 139                 regmap_update_bits(keys->regmap, pmic_rst_reg,
 140                                    MTK_PMIC_HOMEKEY_RST,
 141                                    0);
 142                 break;
 143         default:
 144                 break;
 145         }
 146 }
 147
 148 static irqreturn_t mtk_pmic_keys_irq_handler_thread(int irq, void *data)
 149 {
 150         struct mtk_pmic_keys_info *info = data;
 151         u32 key_deb, pressed;
 152
 153         regmap_read(info->keys->regmap, info->regs->deb_reg, &key_deb);
 154
 155         key_deb &= info->regs->deb_mask;
 156
 157         pressed = !key_deb;
 158
 159         input_report_key(info->keys->input_dev, info->keycode, pressed);
 160         input_sync(info->keys->input_dev);
 161
 162         dev_dbg(info->keys->dev, "(%s) key =%d using PMIC\n",
 163                  pressed ? "pressed" : "released", info->keycode);
 164
 165         return IRQ_HANDLED;
 166 }
 167
 168 static int mtk_pmic_key_setup(struct mtk_pmic_keys *keys,
 169                 struct mtk_pmic_keys_info *info)
 170 {
 171         int ret;
 172
 173         info->keys = keys;
 174
 175         ret = regmap_update_bits(keys->regmap, info->regs->intsel_reg,
 176                                  info->regs->intsel_mask,
 177                                  info->regs->intsel_mask);
 178         if (ret < 0)
 179                 return ret;
 180
 181         ret = devm_request_threaded_irq(keys->dev, info->irq, NULL,
 182                                         mtk_pmic_keys_irq_handler_thread,
 183                                         IRQF_ONESHOT | IRQF_TRIGGER_HIGH,
 184                                         "mtk-pmic-keys", info);
 185         if (ret) {
 186                 dev_err(keys->dev, "Failed to request IRQ: %d: %d\n",
 187                         info->irq, ret);
 188                 return ret;
 189         }
 190
 191         input_set_capability(keys->input_dev, EV_KEY, info->keycode);
 192
 193         return 0;
 194 }
 195
 196 static int __maybe_unused mtk_pmic_keys_suspend(struct device *dev)
 197 {
 198         struct mtk_pmic_keys *keys = dev_get_drvdata(dev);
 199         int index;
 200
 201         for (index = 0; index < MTK_PMIC_MAX_KEY_COUNT; index++) {
 202                 if (keys->keys[index].wakeup)
 203                         enable_irq_wake(keys->keys[index].irq);
 204         }
 205
 206         return 0;
 207 }
 208
 209 static int __maybe_unused mtk_pmic_keys_resume(struct device *dev)
 210 {
 211         struct mtk_pmic_keys *keys = dev_get_drvdata(dev);
 212         int index;
 213
 214         for (index = 0; index < MTK_PMIC_MAX_KEY_COUNT; index++) {
 215                 if (keys->keys[index].wakeup)
 216                         disable_irq_wake(keys->keys[index].irq);
 217         }
 218
 219         return 0;
 220 }
 221
 222 static SIMPLE_DEV_PM_OPS(mtk_pmic_keys_pm_ops, mtk_pmic_keys_suspend,
 223                         mtk_pmic_keys_resume);
 224
 225 static const struct of_device_id of_mtk_pmic_keys_match_tbl[] = {
 226         {
 227                 .compatible = "mediatek,mt6397-keys",
 228                 .data = &mt6397_regs,
 229         }, {
 230                 .compatible = "mediatek,mt6323-keys",
 231                 .data = &mt6323_regs,
 232         }, {
 233                 /* sentinel */
 234         }
 235 };
 236 MODULE_DEVICE_TABLE(of, of_mtk_pmic_keys_match_tbl);
 237
 238 static int mtk_pmic_keys_probe(struct platform_device *pdev)
 239 {
 240         int error, index = 0;
 241         unsigned int keycount;
 242         struct mt6397_chip *pmic_chip = dev_get_drvdata(pdev->dev.parent);
 243         struct device_node *node = pdev->dev.of_node, *child;
 244         struct mtk_pmic_keys *keys;
 245         const struct mtk_pmic_regs *mtk_pmic_regs;
 246         struct input_dev *input_dev;
 247         const struct of_device_id *of_id =
 248                 of_match_device(of_mtk_pmic_keys_match_tbl, &pdev->dev);
 249
 250         keys = devm_kzalloc(&pdev->dev, sizeof(*keys), GFP_KERNEL);
 251         if (!keys)
 252                 return -ENOMEM;
 253
 254         keys->dev = &pdev->dev;
 255         keys->regmap = pmic_chip->regmap;
 256         mtk_pmic_regs = of_id->data;
 257
 258         keys->input_dev = input_dev = devm_input_allocate_device(keys->dev);
 259         if (!input_dev) {
 260                 dev_err(keys->dev, "input allocate device fail.\n");
 261                 return -ENOMEM;
 262         }
 263
 264         input_dev->name = "mtk-pmic-keys";
 265         input_dev->id.bustype = BUS_HOST;
 266         input_dev->id.vendor = 0x0001;
 267         input_dev->id.product = 0x0001;
 268         input_dev->id.version = 0x0001;
 269
 270         keycount = of_get_available_child_count(node);
 271         if (keycount > MTK_PMIC_MAX_KEY_COUNT) {
 272                 dev_err(keys->dev, "too many keys defined (%d)\n", keycount);
 273                 return -EINVAL;
 274         }
 275
 276         for_each_child_of_node(node, child) {
 277                 keys->keys[index].regs = &mtk_pmic_regs->keys_regs[index];
 278
 279                 keys->keys[index].irq = platform_get_irq(pdev, index);
 280                 if (keys->keys[index].irq < 0) {
 281                         of_node_put(child);
 282                         return keys->keys[index].irq;
 283                 }
 284
 285                 error = of_property_read_u32(child,
 286                         "linux,keycodes", &keys->keys[index].keycode);
 287                 if (error) {
 288                         dev_err(keys->dev,
 289                                 "failed to read key:%d linux,keycode property: %d\n",
 290                                 index, error);
 291                         of_node_put(child);
 292                         return error;
 293                 }
 294
 295                 if (of_property_read_bool(child, "wakeup-source"))
 296                         keys->keys[index].wakeup = true;
 297
 298                 error = mtk_pmic_key_setup(keys, &keys->keys[index]);
 299                 if (error) {
 300                         of_node_put(child);
 301                         return error;
 302                 }
 303
 304                 index++;
 305         }
 306
 307         error = input_register_device(input_dev);
 308         if (error) {
 309                 dev_err(&pdev->dev,
 310                         "register input device failed (%d)\n", error);
 311                 return error;
 312         }
 313
 314         mtk_pmic_keys_lp_reset_setup(keys, mtk_pmic_regs->pmic_rst_reg);
 315
 316         platform_set_drvdata(pdev, keys);
 317
 318         return 0;
 319 }
 320
 321 static struct platform_driver pmic_keys_pdrv = {
 322         .probe = mtk_pmic_keys_probe,
 323         .driver = {
 324                    .name = "mtk-pmic-keys",
 325                    .of_match_table = of_mtk_pmic_keys_match_tbl,
 326                    .pm = &mtk_pmic_keys_pm_ops,
 327         },
 328 };
 329
 330 module_platform_driver(pmic_keys_pdrv);
 331
 332 MODULE_LICENSE("GPL v2");
 333 MODULE_AUTHOR("Chen Zhong <chen.zhong@mediatek.com>");
 334 MODULE_DESCRIPTION("MTK pmic-keys driver v0.1");