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