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Subject[PATCH v4 4/5] input: Add MediaTek PMIC keys support
Date
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.zhong@mediatek.com>
---
drivers/input/keyboard/Kconfig | 9 +
drivers/input/keyboard/Makefile | 1 +
drivers/input/keyboard/mtk-pmic-keys.c | 354 ++++++++++++++++++++++++++++++++
3 files changed, 364 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..bd4e20a 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 (powerkey/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..23b6ee4
--- /dev/null
+++ b/drivers/input/keyboard/mtk-pmic-keys.c
@@ -0,0 +1,354 @@
+/*
+ * Copyright (C) 2017 MediaTek, Inc.
+ *
+ * Author: Chen Zhong <chen.zhong@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>
+
+#define MTK_PMIC_PWRKEY_RST_EN_MASK 0x1
+#define MTK_PMIC_PWRKEY_RST_EN_SHIFT 6
+#define MTK_PMIC_HOMEKEY_RST_EN_MASK 0x1
+#define MTK_PMIC_HOMEKEY_RST_EN_SHIFT 5
+#define MTK_PMIC_RST_DU_MASK 0x3
+#define MTK_PMIC_RST_DU_SHIFT 8
+
+#define MTK_PMIC_PWRKEY_RST \
+ (MTK_PMIC_PWRKEY_RST_EN_MASK << MTK_PMIC_PWRKEY_RST_EN_SHIFT)
+#define MTK_PMIC_HOMEKEY_RST \
+ (MTK_PMIC_HOMEKEY_RST_EN_MASK << MTK_PMIC_HOMEKEY_RST_EN_SHIFT)
+
+#define MTK_PMIC_PWRKEY_INDEX 0
+#define MTK_PMIC_HOMEKEY_INDEX 1
+#define MTK_PMIC_MAX_KEY_COUNT 2
+
+struct mtk_pmic_keys_regs {
+ u32 deb_reg;
+ u32 deb_mask;
+ u32 intsel_reg;
+ u32 intsel_mask;
+};
+
+#define MTK_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 mtk_pmic_regs {
+ const struct mtk_pmic_keys_regs keys_regs[MTK_PMIC_MAX_KEY_COUNT];
+ u32 pmic_rst_reg;
+};
+
+static const struct mtk_pmic_regs mt6397_regs = {
+ .keys_regs[MTK_PMIC_PWRKEY_INDEX] =
+ MTK_PMIC_KEYS_REGS(MT6397_CHRSTATUS,
+ 0x8, MT6397_INT_RSV, 0x10),
+ .keys_regs[MTK_PMIC_HOMEKEY_INDEX] =
+ MTK_PMIC_KEYS_REGS(MT6397_OCSTATUS2,
+ 0x10, MT6397_INT_RSV, 0x8),
+ .pmic_rst_reg = MT6397_TOP_RST_MISC,
+};
+
+static const struct mtk_pmic_regs mt6323_regs = {
+ .keys_regs[MTK_PMIC_PWRKEY_INDEX] =
+ MTK_PMIC_KEYS_REGS(MT6323_CHRSTATUS,
+ 0x2, MT6323_INT_MISC_CON, 0x10),
+ .keys_regs[MTK_PMIC_HOMEKEY_INDEX] =
+ MTK_PMIC_KEYS_REGS(MT6323_CHRSTATUS,
+ 0x4, MT6323_INT_MISC_CON, 0x8),
+ .pmic_rst_reg = MT6323_TOP_RST_MISC,
+};
+
+struct mtk_pmic_keys_info {
+ struct mtk_pmic_keys *keys;
+ const struct mtk_pmic_keys_regs *regs;
+ unsigned int keycode;
+ int irq;
+ bool wakeup:1;
+};
+
+struct mtk_pmic_keys {
+ struct input_dev *input_dev;
+ struct device *dev;
+ struct regmap *regmap;
+ struct mtk_pmic_keys_info keys[MTK_PMIC_MAX_KEY_COUNT];
+};
+
+enum mtk_pmic_keys_lp_mode {
+ LP_DISABLE,
+ LP_ONEKEY,
+ LP_TWOKEY,
+};
+
+static void mtk_pmic_keys_lp_reset_setup(struct mtk_pmic_keys *keys,
+ u32 pmic_rst_reg)
+{
+ int ret;
+ u32 long_press_mode, long_press_debounce;
+
+ ret = of_property_read_u32(keys->dev->of_node,
+ "debounce-interval", &long_press_debounce);
+ if (ret)
+ long_press_debounce = 0;
+
+ regmap_update_bits(keys->regmap, pmic_rst_reg,
+ MTK_PMIC_RST_DU_MASK << MTK_PMIC_RST_DU_SHIFT,
+ long_press_debounce << MTK_PMIC_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,
+ MTK_PMIC_PWRKEY_RST,
+ MTK_PMIC_PWRKEY_RST);
+ regmap_update_bits(keys->regmap, pmic_rst_reg,
+ MTK_PMIC_HOMEKEY_RST,
+ 0);
+ break;
+ case LP_TWOKEY:
+ regmap_update_bits(keys->regmap, pmic_rst_reg,
+ MTK_PMIC_PWRKEY_RST,
+ MTK_PMIC_PWRKEY_RST);
+ regmap_update_bits(keys->regmap, pmic_rst_reg,
+ MTK_PMIC_HOMEKEY_RST,
+ MTK_PMIC_HOMEKEY_RST);
+ break;
+ case LP_DISABLE:
+ regmap_update_bits(keys->regmap, pmic_rst_reg,
+ MTK_PMIC_PWRKEY_RST,
+ 0);
+ regmap_update_bits(keys->regmap, pmic_rst_reg,
+ MTK_PMIC_HOMEKEY_RST,
+ 0);
+ break;
+ default:
+ break;
+ }
+}
+
+static irqreturn_t mtk_pmic_keys_irq_handler_thread(int irq, void *data)
+{
+ struct mtk_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, "(%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,
+ struct mtk_pmic_keys_info *info)
+{
+ int ret;
+
+ 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;
+ }
+
+ input_set_capability(keys->input_dev, EV_KEY, info->keycode);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int mtk_pmic_keys_suspend(struct device *dev)
+{
+ struct mtk_pmic_keys *keys = dev_get_drvdata(dev);
+ int index;
+
+ for (index = 0; index < MTK_PMIC_MAX_KEY_COUNT; index++) {
+ if (keys->keys[index].wakeup)
+ enable_irq_wake(keys->keys[index].irq);
+ }
+
+ return 0;
+}
+
+static int mtk_pmic_keys_resume(struct device *dev)
+{
+ struct mtk_pmic_keys *keys = dev_get_drvdata(dev);
+ int index;
+
+ for (index = 0; index < MTK_PMIC_MAX_KEY_COUNT; index++) {
+ if (keys->keys[index].wakeup)
+ disable_irq_wake(keys->keys[index].irq);
+ }
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(mtk_pmic_keys_pm_ops, mtk_pmic_keys_suspend,
+ mtk_pmic_keys_resume);
+
+static const struct of_device_id of_mtk_pmic_keys_match_tbl[] = {
+ {
+ .compatible = "mediatek,mt6397-keys",
+ .data = &mt6397_regs,
+ }, {
+ .compatible = "mediatek,mt6323-keys",
+ .data = &mt6323_regs,
+ }, {
+ /* sentinel */
+ }
+};
+MODULE_DEVICE_TABLE(of, of_mtk_pmic_keys_match_tbl);
+
+static int mtk_pmic_keys_probe(struct platform_device *pdev)
+{
+ int error, index = 0;
+ unsigned int keycount;
+ unsigned int keycodes[MTK_PMIC_MAX_KEY_COUNT];
+ unsigned int wakeup_srcs[MTK_PMIC_MAX_KEY_COUNT] = {0};
+ struct mt6397_chip *pmic_chip = dev_get_drvdata(pdev->dev.parent);
+ struct mtk_pmic_keys *keys;
+ const struct mtk_pmic_regs *mtk_pmic_regs;
+ struct input_dev *input_dev;
+ const struct of_device_id *of_id =
+ of_match_device(of_mtk_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;
+ mtk_pmic_regs = of_id->data;
+
+ keys->input_dev = input_dev = devm_input_allocate_device(keys->dev);
+ if (!input_dev) {
+ dev_err(keys->dev, "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;
+
+ keycount = device_property_read_u32_array(keys->dev, "linux,keycodes",
+ NULL, 0);
+ if (keycount > MTK_PMIC_MAX_KEY_COUNT) {
+ dev_err(keys->dev, "too many keys defined (%d)\n", keycount);
+ return -EINVAL;
+ }
+
+ error = device_property_read_u32_array(keys->dev, "linux,keycodes",
+ keycodes, keycount);
+ if (error) {
+ dev_err(keys->dev,
+ "failed to read linux,keycode property: %d\n", error);
+ return error;
+ }
+
+ if (device_property_read_bool(keys->dev, "wakeup-source")) {
+ error = device_property_read_u32_array(keys->dev,
+ "mediatek,wakeup-keys",
+ wakeup_srcs, keycount);
+ if (error) {
+ dev_err(keys->dev,
+ "failed to read wakeup-source property: %d\n",
+ error);
+ return error;
+ }
+ }
+
+ for (index = 0; index < keycount; index++) {
+ keys->keys[index].regs = &mtk_pmic_regs->keys_regs[index];
+
+ keys->keys[index].irq = platform_get_irq(pdev, index);
+ if (keys->keys[index].irq < 0)
+ return keys->keys[index].irq;
+
+ keys->keys[index].keycode = keycodes[index];
+
+ if (wakeup_srcs[index])
+ keys->keys[index].wakeup = true;
+
+ error = mtk_pmic_key_setup(keys, &keys->keys[index]);
+ if (error)
+ return error;
+ }
+
+ error = input_register_device(input_dev);
+ if (error) {
+ dev_err(&pdev->dev,
+ "register input device failed (%d)\n", error);
+ return error;
+ }
+
+ mtk_pmic_keys_lp_reset_setup(keys, mtk_pmic_regs->pmic_rst_reg);
+
+ platform_set_drvdata(pdev, keys);
+
+ return 0;
+}
+
+static struct platform_driver pmic_keys_pdrv = {
+ .probe = mtk_pmic_keys_probe,
+ .driver = {
+ .name = "mtk-pmic-keys",
+ .of_match_table = of_mtk_pmic_keys_match_tbl,
+ .pm = &mtk_pmic_keys_pm_ops,
+ },
+};
+
+module_platform_driver(pmic_keys_pdrv);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Chen Zhong <chen.zhong@mediatek.com>");
+MODULE_DESCRIPTION("MTK pmic-keys driver v0.1");
--
1.7.9.5
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