This patch add support to handle MediaTek PMIC MT6397/MT6323 key
interrupts including pwrkey and homekey, also add setting for
long press key shutdown behavior.

Signed-off-by: Chen Zhong <chen.zh...@mediatek.com>
---
 drivers/input/keyboard/Kconfig         |    9 +
 drivers/input/keyboard/Makefile        |    1 +
 drivers/input/keyboard/mtk-pmic-keys.c |  331 ++++++++++++++++++++++++++++++++
 3 files changed, 341 insertions(+)
 create mode 100644 drivers/input/keyboard/mtk-pmic-keys.c

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 4c4ab1c..730d9b5 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -756,4 +756,13 @@ config KEYBOARD_BCM
          To compile this driver as a module, choose M here: the
          module will be called bcm-keypad.
 
+config KEYBOARD_MTK_PMIC
+       tristate "MediaTek PMIC keys support"
+       depends on MFD_MT6397
+       help
+         Say Y here if you want to use the pmic keys (pwrkey/homekey).
+
+         To compile this driver as a module, choose M here: the
+         module will be called pmic-keys.
+
 endif
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index d2338ba..20c0b98 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -40,6 +40,7 @@ obj-$(CONFIG_KEYBOARD_MATRIX)         += matrix_keypad.o
 obj-$(CONFIG_KEYBOARD_MAX7359)         += max7359_keypad.o
 obj-$(CONFIG_KEYBOARD_MCS)             += mcs_touchkey.o
 obj-$(CONFIG_KEYBOARD_MPR121)          += mpr121_touchkey.o
+obj-$(CONFIG_KEYBOARD_MTK_PMIC)        += mtk-pmic-keys.o
 obj-$(CONFIG_KEYBOARD_NEWTON)          += newtonkbd.o
 obj-$(CONFIG_KEYBOARD_NOMADIK)         += nomadik-ske-keypad.o
 obj-$(CONFIG_KEYBOARD_NSPIRE)          += nspire-keypad.o
diff --git a/drivers/input/keyboard/mtk-pmic-keys.c 
b/drivers/input/keyboard/mtk-pmic-keys.c
new file mode 100644
index 0000000..5d1f133
--- /dev/null
+++ b/drivers/input/keyboard/mtk-pmic-keys.c
@@ -0,0 +1,331 @@
+/*
+ * Copyright (C) 2017 MediaTek, Inc.
+ *
+ * Author: Chen Zhong <chen.zh...@mediatek.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/mfd/mt6323/registers.h>
+#include <linux/mfd/mt6397/registers.h>
+#include <linux/mfd/mt6397/core.h>
+#include <linux/slab.h>
+#include <linux/irqdomain.h>
+
+#define PWRKEY_RST_EN_MASK     0x1
+#define PWRKEY_RST_EN_SHIFT    6
+#define HOMEKEY_RST_EN_MASK    0x1
+#define HOMEKEY_RST_EN_SHIFT   5
+#define RST_DU_MASK            0x3
+#define RST_DU_SHIFT           8
+
+struct pmic_keys_regs {
+       u32 deb_reg;
+       u32 deb_mask;
+       u32 intsel_reg;
+       u32 intsel_mask;
+};
+
+#define PMIC_KEYS_REGS(_deb_reg, _deb_mask, _intsel_reg, _intsel_mask) \
+{                                                                      \
+       .deb_reg                = _deb_reg,                             \
+       .deb_mask               = _deb_mask,                            \
+       .intsel_reg             = _intsel_reg,                          \
+       .intsel_mask            = _intsel_mask,                         \
+}
+
+struct pmic_regs {
+       const struct pmic_keys_regs pwrkey_regs;
+       const struct pmic_keys_regs homekey_regs;
+       u32 pmic_rst_reg;
+};
+
+static const struct pmic_regs mt6397_regs = {
+       .pwrkey_regs = PMIC_KEYS_REGS(MT6397_CHRSTATUS,
+               0x8, MT6397_INT_RSV, 0x10),
+       .homekey_regs = PMIC_KEYS_REGS(MT6397_OCSTATUS2,
+               0x10, MT6397_INT_RSV, 0x8),
+       .pmic_rst_reg = MT6397_TOP_RST_MISC,
+};
+
+static const struct pmic_regs mt6323_regs = {
+       .pwrkey_regs = PMIC_KEYS_REGS(MT6323_CHRSTATUS,
+               0x2, MT6323_INT_MISC_CON, 0x10),
+       .homekey_regs = PMIC_KEYS_REGS(MT6323_CHRSTATUS,
+               0x4, MT6323_INT_MISC_CON, 0x8),
+       .pmic_rst_reg = MT6323_TOP_RST_MISC,
+};
+
+struct pmic_keys_info {
+       struct mtk_pmic_keys *keys;
+       const struct pmic_keys_regs *regs;
+       int keycode;
+       int irq;
+};
+
+struct mtk_pmic_keys {
+       struct input_dev *input_dev;
+       struct device *dev;
+       struct regmap *regmap;
+       struct irq_domain *irq_domain;
+       struct pmic_keys_info pwrkey, homekey;
+};
+
+enum long_press_mode {
+       LP_DISABLE,
+       LP_ONEKEY,
+       LP_TWOKEY,
+};
+
+static void long_press_reset_setup(struct mtk_pmic_keys *keys, u32 
pmic_rst_reg)
+{
+       int ret;
+       u32 long_press_mode, long_press_duration;
+
+       ret = of_property_read_u32(keys->dev->of_node,
+               "mediatek,long-press-duration", &long_press_duration);
+       if (ret)
+               long_press_duration = 0;
+
+       regmap_update_bits(keys->regmap, pmic_rst_reg,
+                          RST_DU_MASK << RST_DU_SHIFT,
+                          long_press_duration << RST_DU_SHIFT);
+
+       ret = of_property_read_u32(keys->dev->of_node,
+               "mediatek,long-press-mode", &long_press_mode);
+       if (ret)
+               long_press_mode = LP_DISABLE;
+
+       switch (long_press_mode) {
+       case LP_ONEKEY:
+               regmap_update_bits(keys->regmap, pmic_rst_reg,
+                                  PWRKEY_RST_EN_MASK << PWRKEY_RST_EN_SHIFT,
+                                  PWRKEY_RST_EN_MASK << PWRKEY_RST_EN_SHIFT);
+               regmap_update_bits(keys->regmap, pmic_rst_reg,
+                                  HOMEKEY_RST_EN_MASK << HOMEKEY_RST_EN_SHIFT,
+                                  0);
+               break;
+       case LP_TWOKEY:
+               regmap_update_bits(keys->regmap, pmic_rst_reg,
+                                  PWRKEY_RST_EN_MASK << PWRKEY_RST_EN_SHIFT,
+                                  PWRKEY_RST_EN_MASK << PWRKEY_RST_EN_SHIFT);
+               regmap_update_bits(keys->regmap, pmic_rst_reg,
+                                  HOMEKEY_RST_EN_MASK << HOMEKEY_RST_EN_SHIFT,
+                                  HOMEKEY_RST_EN_MASK << HOMEKEY_RST_EN_SHIFT);
+               break;
+       case LP_DISABLE:
+               regmap_update_bits(keys->regmap, pmic_rst_reg,
+                                  PWRKEY_RST_EN_MASK << PWRKEY_RST_EN_SHIFT,
+                                  0);
+               regmap_update_bits(keys->regmap, pmic_rst_reg,
+                                  HOMEKEY_RST_EN_MASK << HOMEKEY_RST_EN_SHIFT,
+                                  0);
+               break;
+       default:
+               break;
+       }
+}
+
+static irqreturn_t mtk_pmic_keys_irq_handler_thread(int irq, void *data)
+{
+       struct pmic_keys_info *info = data;
+       u32 key_deb, pressed;
+
+       regmap_read(info->keys->regmap, info->regs->deb_reg, &key_deb);
+
+       key_deb &= info->regs->deb_mask;
+
+       pressed = !key_deb;
+
+       input_report_key(info->keys->input_dev, info->keycode, pressed);
+       input_sync(info->keys->input_dev);
+
+       dev_dbg(info->keys->dev, "[PMICKEYS] (%s) key =%d using PMIC\n",
+                pressed ? "pressed" : "released", info->keycode);
+
+       return IRQ_HANDLED;
+}
+
+static int mtk_pmic_key_setup(struct mtk_pmic_keys *keys,
+               const char *propname, struct pmic_keys_info *info, bool wakeup)
+{
+       int ret;
+
+       ret = of_property_read_u32(keys->dev->of_node,
+               propname, &info->keycode);
+       if (ret)
+               return 0;
+
+       if (!info->keycode)
+               return 0;
+
+       info->keys = keys;
+
+       ret = regmap_update_bits(keys->regmap, info->regs->intsel_reg,
+                                info->regs->intsel_mask,
+                                info->regs->intsel_mask);
+       if (ret < 0)
+               return ret;
+
+       ret = devm_request_threaded_irq(keys->dev, info->irq, NULL,
+                                       mtk_pmic_keys_irq_handler_thread,
+                                       IRQF_ONESHOT | IRQF_TRIGGER_HIGH,
+                                       "mtk-pmic-keys", info);
+       if (ret) {
+               dev_err(keys->dev, "Failed to request IRQ: %d: %d\n",
+                       info->irq, ret);
+               return ret;
+       }
+
+       if (wakeup)
+               irq_set_irq_wake(info->irq, 1);
+
+       input_set_capability(keys->input_dev, EV_KEY, info->keycode);
+
+       return 0;
+}
+
+static void mtk_pmic_keys_dispose_irq(struct mtk_pmic_keys *keys)
+{
+       if (keys->pwrkey.irq)
+               irq_dispose_mapping(keys->pwrkey.irq);
+
+       if (keys->homekey.irq)
+               irq_dispose_mapping(keys->homekey.irq);
+}
+
+static const struct of_device_id of_pmic_keys_match_tbl[] = {
+       {
+               .compatible = "mediatek,mt6397-keys",
+               .data = &mt6397_regs,
+       }, {
+               .compatible = "mediatek,mt6323-keys",
+               .data = &mt6323_regs,
+       }, {
+               /* sentinel */
+       }
+};
+MODULE_DEVICE_TABLE(of, of_pmic_keys_match_tbl);
+
+static int mtk_pmic_keys_probe(struct platform_device *pdev)
+{
+       int ret;
+       struct resource *res_pwrkey, *res_homekey;
+       struct mt6397_chip *pmic_chip = dev_get_drvdata(pdev->dev.parent);
+       struct mtk_pmic_keys *keys;
+       const struct pmic_regs *pmic_regs;
+       struct input_dev *input_dev;
+       const struct of_device_id *of_id =
+               of_match_device(of_pmic_keys_match_tbl, &pdev->dev);
+
+       keys = devm_kzalloc(&pdev->dev, sizeof(*keys), GFP_KERNEL);
+       if (!keys)
+               return -ENOMEM;
+
+       keys->dev = &pdev->dev;
+       keys->regmap = pmic_chip->regmap;
+       keys->irq_domain = pmic_chip->irq_domain;
+
+       pmic_regs = of_id->data;
+       keys->pwrkey.regs = &pmic_regs->pwrkey_regs;
+       keys->homekey.regs = &pmic_regs->homekey_regs;
+
+       res_pwrkey = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+       if (!res_pwrkey) {
+               dev_err(&pdev->dev, "no IRQ resource\n");
+               return -ENODEV;
+       }
+
+       keys->pwrkey.irq = res_pwrkey->start;
+       if (keys->pwrkey.irq <= 0)
+               return -EINVAL;
+
+       res_homekey = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
+       if (!res_homekey) {
+               dev_err(&pdev->dev, "no IRQ resource\n");
+               return -ENODEV;
+       }
+
+       keys->homekey.irq = res_homekey->start;
+       if (keys->homekey.irq <= 0)
+               return -EINVAL;
+
+       keys->input_dev = input_dev = devm_input_allocate_device(keys->dev);
+       if (!input_dev) {
+               dev_err(&pdev->dev, "[PMICKEYS] input allocate device fail.\n");
+               return -ENOMEM;
+       }
+
+       input_dev->name = "mtk-pmic-keys";
+       input_dev->id.bustype = BUS_HOST;
+       input_dev->id.vendor = 0x0001;
+       input_dev->id.product = 0x0001;
+       input_dev->id.version = 0x0001;
+       input_dev->dev.parent = &pdev->dev;
+
+       ret = mtk_pmic_key_setup(keys, "mediatek,pwrkey-code",
+                                &keys->pwrkey, true);
+       if (ret)
+               goto out_dispose_irq;
+
+       ret = mtk_pmic_key_setup(keys, "mediatek,homekey-code",
+                                &keys->homekey, false);
+       if (ret)
+               goto out_dispose_irq;
+
+       ret = input_register_device(input_dev);
+       if (ret) {
+               dev_err(&pdev->dev,
+                       "[PMICKEYS] register input device failed (%d)\n", ret);
+               return ret;
+       }
+
+       long_press_reset_setup(keys, pmic_regs->pmic_rst_reg);
+
+       return 0;
+
+out_dispose_irq:
+       mtk_pmic_keys_dispose_irq(keys);
+       return ret;
+}
+
+static int mtk_pmic_keys_remove(struct platform_device *pdev)
+{
+       struct mtk_pmic_keys *keys = platform_get_drvdata(pdev);
+
+       mtk_pmic_keys_dispose_irq(keys);
+
+       return 0;
+}
+
+static struct platform_driver pmic_keys_pdrv = {
+       .probe = mtk_pmic_keys_probe,
+       .remove = mtk_pmic_keys_remove,
+       .driver = {
+                  .name = "mtk-pmic-keys",
+                  .of_match_table = of_pmic_keys_match_tbl,
+       },
+};
+
+module_platform_driver(pmic_keys_pdrv);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Chen Zhong <chen.zh...@mediatek.com>");
+MODULE_DESCRIPTION("MTK pmic-keys driver v0.1");
-- 
1.7.9.5

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