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

   1 /*
   2  * Copyright (C) 2017 MediaTek, Inc.
   3  *
   4  * Author: Chen Zhong <chen.zhong@mediatek.com>
   5  *
   6  * This software is licensed under the terms of the GNU General Public
   7  * License version 2, as published by the Free Software Foundation, and
   8  * may be copied, distributed, and modified under those terms.
   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
  17 #include <linux/module.h>
  18 #include <linux/kernel.h>
  19 #include <linux/input.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/kernel.h>
  23 #include <linux/of.h>
  24 #include <linux/of_device.h>
  25 #include <linux/regmap.h>
  26 #include <linux/mfd/mt6323/registers.h>
  27 #include <linux/mfd/mt6397/registers.h>
  28 #include <linux/mfd/mt6397/core.h>
  29
  30 #define MTK_PMIC_PWRKEY_RST_EN_MASK     0x1
  31 #define MTK_PMIC_PWRKEY_RST_EN_SHIFT    6
  32 #define MTK_PMIC_HOMEKEY_RST_EN_MASK    0x1
  33 #define MTK_PMIC_HOMEKEY_RST_EN_SHIFT   5
  34 #define MTK_PMIC_RST_DU_MASK            0x3
  35 #define MTK_PMIC_RST_DU_SHIFT           8
  36
  37 #define MTK_PMIC_PWRKEY_RST             \
  38         (MTK_PMIC_PWRKEY_RST_EN_MASK << MTK_PMIC_PWRKEY_RST_EN_SHIFT)
  39 #define MTK_PMIC_HOMEKEY_RST            \
  40         (MTK_PMIC_HOMEKEY_RST_EN_MASK << MTK_PMIC_HOMEKEY_RST_EN_SHIFT)
  41
  42 #define MTK_PMIC_PWRKEY_INDEX   0
  43 #define MTK_PMIC_HOMEKEY_INDEX  1
  44 #define MTK_PMIC_MAX_KEY_COUNT  2
  45
  46 struct mtk_pmic_keys_regs {
  47         u32 deb_reg;
  48         u32 deb_mask;
  49         u32 intsel_reg;
  50         u32 intsel_mask;
  51 };
  52
  53 #define MTK_PMIC_KEYS_REGS(_deb_reg, _deb_mask,         \
  54         _intsel_reg, _intsel_mask)                      \
  55 {                                                       \
  56         .deb_reg                = _deb_reg,             \
  57         .deb_mask               = _deb_mask,            \
  58         .intsel_reg             = _intsel_reg,          \
  59         .intsel_mask            = _intsel_mask,         \
  60 }
  61
  62 struct mtk_pmic_regs {
  63         const struct mtk_pmic_keys_regs keys_regs[MTK_PMIC_MAX_KEY_COUNT];
  64         u32 pmic_rst_reg;
  65 };
  66
  67 static const struct mtk_pmic_regs mt6397_regs = {
  68         .keys_regs[MTK_PMIC_PWRKEY_INDEX] =
  69                 MTK_PMIC_KEYS_REGS(MT6397_CHRSTATUS,
  70                 0x8, MT6397_INT_RSV, 0x10),
  71         .keys_regs[MTK_PMIC_HOMEKEY_INDEX] =
  72                 MTK_PMIC_KEYS_REGS(MT6397_OCSTATUS2,
  73                 0x10, MT6397_INT_RSV, 0x8),
  74         .pmic_rst_reg = MT6397_TOP_RST_MISC,
  75 };
  76
  77 static const struct mtk_pmic_regs mt6323_regs = {
  78         .keys_regs[MTK_PMIC_PWRKEY_INDEX] =
  79                 MTK_PMIC_KEYS_REGS(MT6323_CHRSTATUS,
  80                 0x2, MT6323_INT_MISC_CON, 0x10),
  81         .keys_regs[MTK_PMIC_HOMEKEY_INDEX] =
  82                 MTK_PMIC_KEYS_REGS(MT6323_CHRSTATUS,
  83                 0x4, MT6323_INT_MISC_CON, 0x8),
  84         .pmic_rst_reg = MT6323_TOP_RST_MISC,
  85 };
  86
  87 struct mtk_pmic_keys_info {
  88         struct mtk_pmic_keys *keys;
  89         const struct mtk_pmic_keys_regs *regs;
  90         unsigned int keycode;
  91         int irq;
  92         bool wakeup:1;
  93 };
  94
  95 struct mtk_pmic_keys {
  96         struct input_dev *input_dev;
  97         struct device *dev;
  98         struct regmap *regmap;
  99         struct mtk_pmic_keys_info keys[MTK_PMIC_MAX_KEY_COUNT];
 100 };
 101
 102 enum mtk_pmic_keys_lp_mode {
 103         LP_DISABLE,
 104         LP_ONEKEY,
 105         LP_TWOKEY,
 106 };
 107
 108 static void mtk_pmic_keys_lp_reset_setup(struct mtk_pmic_keys *keys,
 109                 u32 pmic_rst_reg)
 110 {
 111         int ret;
 112         u32 long_press_mode, long_press_debounce;
 113
 114         ret = of_property_read_u32(keys->dev->of_node,
 115                 "power-off-time-sec", &long_press_debounce);
 116         if (ret)
 117                 long_press_debounce = 0;
 118
 119         regmap_update_bits(keys->regmap, pmic_rst_reg,
 120                            MTK_PMIC_RST_DU_MASK << MTK_PMIC_RST_DU_SHIFT,
 121                            long_press_debounce << MTK_PMIC_RST_DU_SHIFT);
 122
 123         ret = of_property_read_u32(keys->dev->of_node,
 124                 "mediatek,long-press-mode", &long_press_mode);
 125         if (ret)
 126                 long_press_mode = LP_DISABLE;
 127
 128         switch (long_press_mode) {
 129         case LP_ONEKEY:
 130                 regmap_update_bits(keys->regmap, pmic_rst_reg,
 131                                    MTK_PMIC_PWRKEY_RST,
 132                                    MTK_PMIC_PWRKEY_RST);
 133                 regmap_update_bits(keys->regmap, pmic_rst_reg,
 134                                    MTK_PMIC_HOMEKEY_RST,
 135                                    0);
 136                 break;
 137         case LP_TWOKEY:
 138                 regmap_update_bits(keys->regmap, pmic_rst_reg,
 139                                    MTK_PMIC_PWRKEY_RST,
 140                                    MTK_PMIC_PWRKEY_RST);
 141                 regmap_update_bits(keys->regmap, pmic_rst_reg,
 142                                    MTK_PMIC_HOMEKEY_RST,
 143                                    MTK_PMIC_HOMEKEY_RST);
 144                 break;
 145         case LP_DISABLE:
 146                 regmap_update_bits(keys->regmap, pmic_rst_reg,
 147                                    MTK_PMIC_PWRKEY_RST,
 148                                    0);
 149                 regmap_update_bits(keys->regmap, pmic_rst_reg,
 150                                    MTK_PMIC_HOMEKEY_RST,
 151                                    0);
 152                 break;
 153         default:
 154                 break;
 155         }
 156 }
 157
 158 static irqreturn_t mtk_pmic_keys_irq_handler_thread(int irq, void *data)
 159 {
 160         struct mtk_pmic_keys_info *info = data;
 161         u32 key_deb, pressed;
 162
 163         regmap_read(info->keys->regmap, info->regs->deb_reg, &key_deb);
 164
 165         key_deb &= info->regs->deb_mask;
 166
 167         pressed = !key_deb;
 168
 169         input_report_key(info->keys->input_dev, info->keycode, pressed);
 170         input_sync(info->keys->input_dev);
 171
 172         dev_dbg(info->keys->dev, "(%s) key =%d using PMIC\n",
 173                  pressed ? "pressed" : "released", info->keycode);
 174
 175         return IRQ_HANDLED;
 176 }
 177
 178 static int mtk_pmic_key_setup(struct mtk_pmic_keys *keys,
 179                 struct mtk_pmic_keys_info *info)
 180 {
 181         int ret;
 182
 183         info->keys = keys;
 184
 185         ret = regmap_update_bits(keys->regmap, info->regs->intsel_reg,
 186                                  info->regs->intsel_mask,
 187                                  info->regs->intsel_mask);
 188         if (ret < 0)
 189                 return ret;
 190
 191         ret = devm_request_threaded_irq(keys->dev, info->irq, NULL,
 192                                         mtk_pmic_keys_irq_handler_thread,
 193                                         IRQF_ONESHOT | IRQF_TRIGGER_HIGH,
 194                                         "mtk-pmic-keys", info);
 195         if (ret) {
 196                 dev_err(keys->dev, "Failed to request IRQ: %d: %d\n",
 197                         info->irq, ret);
 198                 return ret;
 199         }
 200
 201         input_set_capability(keys->input_dev, EV_KEY, info->keycode);
 202
 203         return 0;
 204 }
 205
 206 static int __maybe_unused mtk_pmic_keys_suspend(struct device *dev)
 207 {
 208         struct mtk_pmic_keys *keys = dev_get_drvdata(dev);
 209         int index;
 210
 211         for (index = 0; index < MTK_PMIC_MAX_KEY_COUNT; index++) {
 212                 if (keys->keys[index].wakeup)
 213                         enable_irq_wake(keys->keys[index].irq);
 214         }
 215
 216         return 0;
 217 }
 218
 219 static int __maybe_unused mtk_pmic_keys_resume(struct device *dev)
 220 {
 221         struct mtk_pmic_keys *keys = dev_get_drvdata(dev);
 222         int index;
 223
 224         for (index = 0; index < MTK_PMIC_MAX_KEY_COUNT; index++) {
 225                 if (keys->keys[index].wakeup)
 226                         disable_irq_wake(keys->keys[index].irq);
 227         }
 228
 229         return 0;
 230 }
 231
 232 static SIMPLE_DEV_PM_OPS(mtk_pmic_keys_pm_ops, mtk_pmic_keys_suspend,
 233                         mtk_pmic_keys_resume);
 234
 235 static const struct of_device_id of_mtk_pmic_keys_match_tbl[] = {
 236         {
 237                 .compatible = "mediatek,mt6397-keys",
 238                 .data = &mt6397_regs,
 239         }, {
 240                 .compatible = "mediatek,mt6323-keys",
 241                 .data = &mt6323_regs,
 242         }, {
 243                 /* sentinel */
 244         }
 245 };
 246 MODULE_DEVICE_TABLE(of, of_mtk_pmic_keys_match_tbl);
 247
 248 static int mtk_pmic_keys_probe(struct platform_device *pdev)
 249 {
 250         int error, index = 0;
 251         unsigned int keycount;
 252         struct mt6397_chip *pmic_chip = dev_get_drvdata(pdev->dev.parent);
 253         struct device_node *node = pdev->dev.of_node, *child;
 254         struct mtk_pmic_keys *keys;
 255         const struct mtk_pmic_regs *mtk_pmic_regs;
 256         struct input_dev *input_dev;
 257         const struct of_device_id *of_id =
 258                 of_match_device(of_mtk_pmic_keys_match_tbl, &pdev->dev);
 259
 260         keys = devm_kzalloc(&pdev->dev, sizeof(*keys), GFP_KERNEL);
 261         if (!keys)
 262                 return -ENOMEM;
 263
 264         keys->dev = &pdev->dev;
 265         keys->regmap = pmic_chip->regmap;
 266         mtk_pmic_regs = of_id->data;
 267
 268         keys->input_dev = input_dev = devm_input_allocate_device(keys->dev);
 269         if (!input_dev) {
 270                 dev_err(keys->dev, "input allocate device fail.\n");
 271                 return -ENOMEM;
 272         }
 273
 274         input_dev->name = "mtk-pmic-keys";
 275         input_dev->id.bustype = BUS_HOST;
 276         input_dev->id.vendor = 0x0001;
 277         input_dev->id.product = 0x0001;
 278         input_dev->id.version = 0x0001;
 279
 280         keycount = of_get_available_child_count(node);
 281         if (keycount > MTK_PMIC_MAX_KEY_COUNT) {
 282                 dev_err(keys->dev, "too many keys defined (%d)\n", keycount);
 283                 return -EINVAL;
 284         }
 285
 286         for_each_child_of_node(node, child) {
 287                 keys->keys[index].regs = &mtk_pmic_regs->keys_regs[index];
 288
 289                 keys->keys[index].irq = platform_get_irq(pdev, index);
 290                 if (keys->keys[index].irq < 0)
 291                         return keys->keys[index].irq;
 292
 293                 error = of_property_read_u32(child,
 294                         "linux,keycodes", &keys->keys[index].keycode);
 295                 if (error) {
 296                         dev_err(keys->dev,
 297                                 "failed to read key:%d linux,keycode property: %d\n",
 298                                 index, error);
 299                         return error;
 300                 }
 301
 302                 if (of_property_read_bool(child, "wakeup-source"))
 303                         keys->keys[index].wakeup = true;
 304
 305                 error = mtk_pmic_key_setup(keys, &keys->keys[index]);
 306                 if (error)
 307                         return error;
 308
 309                 index++;
 310         }
 311
 312         error = input_register_device(input_dev);
 313         if (error) {
 314                 dev_err(&pdev->dev,
 315                         "register input device failed (%d)\n", error);
 316                 return error;
 317         }
 318
 319         mtk_pmic_keys_lp_reset_setup(keys, mtk_pmic_regs->pmic_rst_reg);
 320
 321         platform_set_drvdata(pdev, keys);
 322
 323         return 0;
 324 }
 325
 326 static struct platform_driver pmic_keys_pdrv = {
 327         .probe = mtk_pmic_keys_probe,
 328         .driver = {
 329                    .name = "mtk-pmic-keys",
 330                    .of_match_table = of_mtk_pmic_keys_match_tbl,
 331                    .pm = &mtk_pmic_keys_pm_ops,
 332         },
 333 };
 334
 335 module_platform_driver(pmic_keys_pdrv);
 336
 337 MODULE_LICENSE("GPL v2");
 338 MODULE_AUTHOR("Chen Zhong <chen.zhong@mediatek.com>");
 339 MODULE_DESCRIPTION("MTK pmic-keys driver v0.1");