src/kernel/linux/v4.19/drivers/input/keyboard/mtk-kpd.c - T800 - Gitiles

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2019 MediaTek Inc.
  * Author Terry Chang <terry.chang@mediatek.com>
  */
 #include <linux/atomic.h>
 #include <linux/clk.h>
 #include <linux/debugfs.h>
 #include <linux/delay.h>
 #include <linux/fs.h>
 #include <linux/gpio.h>
 #include <linux/init.h>
 #include <linux/input.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/ioctl.h>
 #include <linux/kernel.h>
 #include <linux/miscdevice.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/pinctrl/consumer.h>
 #include <linux/platform_device.h>
 #include <linux/pm_wakeup.h>
 #include <linux/regmap.h>
 #include <linux/timer.h>
 #include <linux/workqueue.h>

 #define KPD_NAME	"mtk-kpd"

 #define KP_STA			(0x0000)
 #define KP_MEM1			(0x0004)
 #define KP_MEM2			(0x0008)
 #define KP_MEM3			(0x000c)
 #define KP_MEM4			(0x0010)
 #define KP_MEM5			(0x0014)
 #define KP_DEBOUNCE		(0x0018)
 #define KP_SEL			(0x0020)
 #define KP_EN			(0x0024)

 #define KP_COL0_SEL		(1 << 10)
 #define KP_COL1_SEL		(1 << 11)
 #define KP_COL2_SEL		(1 << 12)

 #define KPD_DEBOUNCE_MASK	((1U << 14) - 1)
 #define KPD_DOUBLE_KEY_MASK	(1U << 0)

 #define KPD_NUM_MEMS	5
 #define KPD_MEM5_BITS	8
 #define KPD_NUM_KEYS	72	/* 4 * 16 + KPD_MEM5_BITS */

 struct mtk_keypad {
 	struct input_dev *input_dev;
 	struct wakeup_source *suspend_lock;
 	struct tasklet_struct tasklet;
 	struct clk *clk;
 	void __iomem *base;
 	unsigned int irqnr;
 	u32 key_debounce;
 	u32 hw_map_num;
 	u32 hw_init_map[KPD_NUM_KEYS];
 	u16 keymap_state[KPD_NUM_MEMS];
 };

 void kpd_double_key_enable(void __iomem *kp_base, int en)
 {
 	u16 tmp;

 	tmp = readw(kp_base + KP_SEL);
 	if (en != 0)
 		writew((u16) (tmp | KPD_DOUBLE_KEY_MASK), kp_base + KP_SEL);
 	else
 		writew((u16) (tmp & ~KPD_DOUBLE_KEY_MASK), kp_base + KP_SEL);
 	tmp = readw(kp_base + KP_SEL);
 	pr_info("kpd KP_SEL = %x\n", tmp);
 }

 static void kpd_get_keymap_state(void __iomem *kp_base, u16 state[])
 {
 	state[0] = readw(kp_base + KP_MEM1);
 	state[1] = readw(kp_base + KP_MEM2);
 	state[2] = readw(kp_base + KP_MEM3);
 	state[3] = readw(kp_base + KP_MEM4);
 	state[4] = readw(kp_base + KP_MEM5);
 	pr_debug("kpd register = %x %x %x %x %x\n",
 		state[0], state[1], state[2], state[3], state[4]);
 }

 static void kpd_keymap_handler(unsigned long data)
 {
 	int i, j;
 	int pressed;
 	u16 new_state[KPD_NUM_MEMS], change, mask;
 	u16 hw_keycode, keycode;
 	void *dest;
 	struct mtk_keypad *keypad = (struct mtk_keypad *)data;

 	kpd_get_keymap_state(keypad->base, new_state);

 	__pm_wakeup_event(keypad->suspend_lock, 500);

 	for (i = 0; i < KPD_NUM_MEMS; i++) {
 		change = new_state[i] ^ keypad->keymap_state[i];
 		if (!change)
 			continue;

 		for (j = 0; j < 16U; j++) {
 			mask = (u16) 1 << j;
 			if (!(change & mask))
 				continue;

 			hw_keycode = (i << 4) + j;

 			if (hw_keycode >= KPD_NUM_KEYS)
 				continue;

 			/* bit is 1: not pressed, 0: pressed */
 			pressed = (new_state[i] & mask) == 0U;
 			pr_info("(%s) HW keycode = %d\n",
 				(pressed) ? "pressed" : "released",
 					hw_keycode);

 			keycode = keypad->hw_init_map[hw_keycode];
 			if (!keycode)
 				continue;
 			input_report_key(keypad->input_dev, keycode, pressed);
 			input_sync(keypad->input_dev);
 			pr_info("report Linux keycode = %d\n", keycode);
 		}
 	}

 	dest = memcpy(keypad->keymap_state, new_state, sizeof(new_state));
 	enable_irq(keypad->irqnr);
 }

 static irqreturn_t kpd_irq_handler(int irq, void *dev_id)
 {
 	/* use _nosync to avoid deadlock */
 	struct mtk_keypad *keypad = dev_id;

 	disable_irq_nosync(keypad->irqnr);
 	tasklet_schedule(&keypad->tasklet);
 	return IRQ_HANDLED;
 }

 static int kpd_get_dts_info(struct mtk_keypad *keypad,
 				struct device_node *node)
 {
 	int ret;

 	ret = of_property_read_u32(node, "mediatek,key-debounce-ms",
 		&keypad->key_debounce);
 	if (ret) {
 		pr_debug("read mediatek,key-debounce-ms error.\n");
 		return ret;
 	}

 	ret = of_property_read_u32(node, "mediatek,hw-map-num",
 		&keypad->hw_map_num);
 	if (ret) {
 		pr_debug("read mediatek,hw-map-num error.\n");
 		return ret;
 	}

 	if (keypad->hw_map_num > KPD_NUM_KEYS) {
 		pr_debug("hw-map-num error, it cannot bigger than %d.\n",
 			KPD_NUM_KEYS);
 		return -EINVAL;
 	}

 	ret = of_property_read_u32_array(node, "mediatek,hw-init-map",
 		keypad->hw_init_map, keypad->hw_map_num);

 	if (ret) {
 		pr_debug("hw-init-map was not defined in dts.\n");
 		return ret;
 	}

 	pr_debug("deb= %d\n", keypad->key_debounce);

 	return 0;
 }

 static int kpd_gpio_init(struct device *dev)
 {
 	struct pinctrl *keypad_pinctrl;
 	struct pinctrl_state *kpd_default;

 	keypad_pinctrl = devm_pinctrl_get(dev);
 	if (IS_ERR(keypad_pinctrl)) {
 		pr_debug("Cannot find keypad_pinctrl!\n");

 		return (int)PTR_ERR(keypad_pinctrl);
 	}

 	kpd_default = pinctrl_lookup_state(keypad_pinctrl, "default");
 	if (IS_ERR(kpd_default)) {
 		pr_debug("Cannot find ecall_state!\n");

 		return (int)PTR_ERR(kpd_default);
 	}

 	return pinctrl_select_state(keypad_pinctrl,
 				kpd_default);
 }

 static int kpd_pdrv_probe(struct platform_device *pdev)
 {
 	struct mtk_keypad *keypad;
 	struct resource *res;
 	int i;
 	int err;

 	keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad), GFP_KERNEL);
 	if (!keypad)
 		return -ENOMEM;

 	keypad->clk = devm_clk_get(&pdev->dev, "kpd");
 	if (IS_ERR(keypad->clk)) {
 		pr_notice("get kpd-clk fail: %d\n", (int)PTR_ERR(keypad->clk));
 		return (int)PTR_ERR(keypad->clk);
 	}

 	err = clk_prepare_enable(keypad->clk);
 	if (err) {
 		pr_notice("kpd-clk prepare enable failed.\n");
 		return err;
 	}

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		err = -ENODEV;
 		goto err_unprepare_clk;
 	}

 	keypad->base = devm_ioremap(&pdev->dev, res->start,
 			resource_size(res));
 	if (!keypad->base) {
 		pr_notice("KP iomap failed\n");
 		err = -EBUSY;
 		goto err_unprepare_clk;
 	}

 	keypad->irqnr = irq_of_parse_and_map(pdev->dev.of_node, 0);
 	if (!keypad->irqnr) {
 		pr_notice("KP get irqnr failed\n");
 		err = -ENODEV;
 		goto err_unprepare_clk;
 	}

 	pr_info("kp base: 0x%p, addr:0x%p,  kp irq: %d\n",
 			keypad->base, &keypad->base, keypad->irqnr);
 	err = kpd_gpio_init(&pdev->dev);
 	if (err) {
 		pr_debug("gpio init failed\n");
 		goto err_unprepare_clk;
 	}

 	err = kpd_get_dts_info(keypad, pdev->dev.of_node);
 	if (err) {
 		pr_debug("get dts info failed.\n");
 		goto err_unprepare_clk;
 	}

 	memset(keypad->keymap_state, 0xff, sizeof(keypad->keymap_state));

 	keypad->input_dev = devm_input_allocate_device(&pdev->dev);
 	if (!keypad->input_dev) {
 		pr_notice("input allocate device fail.\n");
 		err = -ENOMEM;
 		goto err_unprepare_clk;
 	}

 	keypad->input_dev->name = KPD_NAME;
 	keypad->input_dev->id.bustype = BUS_HOST;
 	keypad->input_dev->dev.parent = &pdev->dev;

 	__set_bit(EV_KEY, keypad->input_dev->evbit);

 	for (i = 0; i < KPD_NUM_KEYS; i++) {
 		if (keypad->hw_init_map[i])
 			__set_bit(keypad->hw_init_map[i],
 				keypad->input_dev->keybit);
 	}

 	err = input_register_device(keypad->input_dev);
 	if (err) {
 		pr_notice("register input device failed (%d)\n", err);
 		goto err_unprepare_clk;
 	}

 	input_set_drvdata(keypad->input_dev, keypad);

 	keypad->suspend_lock = wakeup_source_register(NULL, "kpd wakelock");
 	if (!keypad->suspend_lock) {
 		pr_notice("wakeup source init failed.\n");
 		err = -ENOMEM;
 		goto err_unregister_device;
 	}

 	tasklet_init(&keypad->tasklet, kpd_keymap_handler,
 					(unsigned long)keypad);

 	kpd_double_key_enable(keypad->base, 1);

 	writew((u16)(keypad->key_debounce & KPD_DEBOUNCE_MASK),
 			keypad->base + KP_DEBOUNCE);

 	/* register IRQ */
 	err = request_irq(keypad->irqnr, kpd_irq_handler, IRQF_TRIGGER_NONE,
 			KPD_NAME, keypad);
 	if (err) {
 		pr_notice("register IRQ failed (%d)\n", err);
 		goto err_irq;
 	}

 	pr_info("kpd_probe OK.\n");

 	return 0;

 err_irq:
 	tasklet_kill(&keypad->tasklet);
 	wakeup_source_unregister(keypad->suspend_lock);

 err_unregister_device:
 	input_unregister_device(keypad->input_dev);

 err_unprepare_clk:
 	clk_disable_unprepare(keypad->clk);

 	return err;
 }


 static int kpd_pdrv_remove(struct platform_device *pdev)
 {
 	struct mtk_keypad *keypad = platform_get_drvdata(pdev);

 	tasklet_kill(&keypad->tasklet);
 	wakeup_source_unregister(keypad->suspend_lock);
 	input_unregister_device(keypad->input_dev);
 	clk_disable_unprepare(keypad->clk);

 	return 0;
 }

 static const struct of_device_id kpd_of_match[] = {
 	{.compatible = "mediatek,mt6779-keypad"},
 	{.compatible = "mediatek,kp"},
 	{},
 };

 static struct platform_driver kpd_pdrv = {
 	.probe = kpd_pdrv_probe,
 	.remove = kpd_pdrv_remove,
 	.driver = {
 		   .name = KPD_NAME,
 		   .of_match_table = kpd_of_match,
 		   },
 };

 module_platform_driver(kpd_pdrv);

 MODULE_AUTHOR("Mediatek Corporation");
 MODULE_DESCRIPTION("MTK Keypad (KPD) Driver");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (C) 2019 MediaTek Inc.
	* Author Terry Chang <terry.chang@mediatek.com>
	*/
	#include <linux/atomic.h>
	#include <linux/clk.h>
	#include <linux/debugfs.h>
	#include <linux/delay.h>
	#include <linux/fs.h>
	#include <linux/gpio.h>
	#include <linux/init.h>
	#include <linux/input.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>
	#include <linux/ioctl.h>
	#include <linux/kernel.h>
	#include <linux/miscdevice.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/of_address.h>
	#include <linux/of_irq.h>
	#include <linux/pinctrl/consumer.h>
	#include <linux/platform_device.h>
	#include <linux/pm_wakeup.h>
	#include <linux/regmap.h>
	#include <linux/timer.h>
	#include <linux/workqueue.h>

	#define KPD_NAME "mtk-kpd"

	#define KP_STA (0x0000)
	#define KP_MEM1 (0x0004)
	#define KP_MEM2 (0x0008)
	#define KP_MEM3 (0x000c)
	#define KP_MEM4 (0x0010)
	#define KP_MEM5 (0x0014)
	#define KP_DEBOUNCE (0x0018)
	#define KP_SEL (0x0020)
	#define KP_EN (0x0024)

	#define KP_COL0_SEL (1 << 10)
	#define KP_COL1_SEL (1 << 11)
	#define KP_COL2_SEL (1 << 12)

	#define KPD_DEBOUNCE_MASK ((1U << 14) - 1)
	#define KPD_DOUBLE_KEY_MASK (1U << 0)

	#define KPD_NUM_MEMS 5
	#define KPD_MEM5_BITS 8
	#define KPD_NUM_KEYS 72 /* 4 * 16 + KPD_MEM5_BITS */

	struct mtk_keypad {
	struct input_dev *input_dev;
	struct wakeup_source *suspend_lock;
	struct tasklet_struct tasklet;
	struct clk *clk;
	void __iomem *base;
	unsigned int irqnr;
	u32 key_debounce;
	u32 hw_map_num;
	u32 hw_init_map[KPD_NUM_KEYS];
	u16 keymap_state[KPD_NUM_MEMS];
	};

	void kpd_double_key_enable(void __iomem *kp_base, int en)
	{
	u16 tmp;

	tmp = readw(kp_base + KP_SEL);
	if (en != 0)
	writew((u16) (tmp \| KPD_DOUBLE_KEY_MASK), kp_base + KP_SEL);
	else
	writew((u16) (tmp & ~KPD_DOUBLE_KEY_MASK), kp_base + KP_SEL);
	tmp = readw(kp_base + KP_SEL);
	pr_info("kpd KP_SEL = %x\n", tmp);
	}

	static void kpd_get_keymap_state(void __iomem *kp_base, u16 state[])
	{
	state[0] = readw(kp_base + KP_MEM1);
	state[1] = readw(kp_base + KP_MEM2);
	state[2] = readw(kp_base + KP_MEM3);
	state[3] = readw(kp_base + KP_MEM4);
	state[4] = readw(kp_base + KP_MEM5);
	pr_debug("kpd register = %x %x %x %x %x\n",
	state[0], state[1], state[2], state[3], state[4]);
	}

	static void kpd_keymap_handler(unsigned long data)
	{
	int i, j;
	int pressed;
	u16 new_state[KPD_NUM_MEMS], change, mask;
	u16 hw_keycode, keycode;
	void *dest;
	struct mtk_keypad keypad = (struct mtk_keypad )data;

	kpd_get_keymap_state(keypad->base, new_state);

	__pm_wakeup_event(keypad->suspend_lock, 500);

	for (i = 0; i < KPD_NUM_MEMS; i++) {
	change = new_state[i] ^ keypad->keymap_state[i];
	if (!change)
	continue;

	for (j = 0; j < 16U; j++) {
	mask = (u16) 1 << j;
	if (!(change & mask))
	continue;

	hw_keycode = (i << 4) + j;

	if (hw_keycode >= KPD_NUM_KEYS)
	continue;

	/* bit is 1: not pressed, 0: pressed */
	pressed = (new_state[i] & mask) == 0U;
	pr_info("(%s) HW keycode = %d\n",
	(pressed) ? "pressed" : "released",
	hw_keycode);

	keycode = keypad->hw_init_map[hw_keycode];
	if (!keycode)
	continue;
	input_report_key(keypad->input_dev, keycode, pressed);
	input_sync(keypad->input_dev);
	pr_info("report Linux keycode = %d\n", keycode);
	}
	}

	dest = memcpy(keypad->keymap_state, new_state, sizeof(new_state));
	enable_irq(keypad->irqnr);
	}

	static irqreturn_t kpd_irq_handler(int irq, void *dev_id)
	{
	/* use _nosync to avoid deadlock */
	struct mtk_keypad *keypad = dev_id;

	disable_irq_nosync(keypad->irqnr);
	tasklet_schedule(&keypad->tasklet);
	return IRQ_HANDLED;
	}

	static int kpd_get_dts_info(struct mtk_keypad *keypad,
	struct device_node *node)
	{
	int ret;

	ret = of_property_read_u32(node, "mediatek,key-debounce-ms",
	&keypad->key_debounce);
	if (ret) {
	pr_debug("read mediatek,key-debounce-ms error.\n");
	return ret;
	}

	ret = of_property_read_u32(node, "mediatek,hw-map-num",
	&keypad->hw_map_num);
	if (ret) {
	pr_debug("read mediatek,hw-map-num error.\n");
	return ret;
	}

	if (keypad->hw_map_num > KPD_NUM_KEYS) {
	pr_debug("hw-map-num error, it cannot bigger than %d.\n",
	KPD_NUM_KEYS);
	return -EINVAL;
	}

	ret = of_property_read_u32_array(node, "mediatek,hw-init-map",
	keypad->hw_init_map, keypad->hw_map_num);

	if (ret) {
	pr_debug("hw-init-map was not defined in dts.\n");
	return ret;
	}

	pr_debug("deb= %d\n", keypad->key_debounce);

	return 0;
	}

	static int kpd_gpio_init(struct device *dev)
	{
	struct pinctrl *keypad_pinctrl;
	struct pinctrl_state *kpd_default;

	keypad_pinctrl = devm_pinctrl_get(dev);
	if (IS_ERR(keypad_pinctrl)) {
	pr_debug("Cannot find keypad_pinctrl!\n");

	return (int)PTR_ERR(keypad_pinctrl);
	}

	kpd_default = pinctrl_lookup_state(keypad_pinctrl, "default");
	if (IS_ERR(kpd_default)) {
	pr_debug("Cannot find ecall_state!\n");

	return (int)PTR_ERR(kpd_default);
	}

	return pinctrl_select_state(keypad_pinctrl,
	kpd_default);
	}

	static int kpd_pdrv_probe(struct platform_device *pdev)
	{
	struct mtk_keypad *keypad;
	struct resource *res;
	int i;
	int err;

	keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad), GFP_KERNEL);
	if (!keypad)
	return -ENOMEM;

	keypad->clk = devm_clk_get(&pdev->dev, "kpd");
	if (IS_ERR(keypad->clk)) {
	pr_notice("get kpd-clk fail: %d\n", (int)PTR_ERR(keypad->clk));
	return (int)PTR_ERR(keypad->clk);
	}

	err = clk_prepare_enable(keypad->clk);
	if (err) {
	pr_notice("kpd-clk prepare enable failed.\n");
	return err;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
	err = -ENODEV;
	goto err_unprepare_clk;
	}

	keypad->base = devm_ioremap(&pdev->dev, res->start,
	resource_size(res));
	if (!keypad->base) {
	pr_notice("KP iomap failed\n");
	err = -EBUSY;
	goto err_unprepare_clk;
	}

	keypad->irqnr = irq_of_parse_and_map(pdev->dev.of_node, 0);
	if (!keypad->irqnr) {
	pr_notice("KP get irqnr failed\n");
	err = -ENODEV;
	goto err_unprepare_clk;
	}

	pr_info("kp base: 0x%p, addr:0x%p, kp irq: %d\n",
	keypad->base, &keypad->base, keypad->irqnr);
	err = kpd_gpio_init(&pdev->dev);
	if (err) {
	pr_debug("gpio init failed\n");
	goto err_unprepare_clk;
	}

	err = kpd_get_dts_info(keypad, pdev->dev.of_node);
	if (err) {
	pr_debug("get dts info failed.\n");
	goto err_unprepare_clk;
	}

	memset(keypad->keymap_state, 0xff, sizeof(keypad->keymap_state));

	keypad->input_dev = devm_input_allocate_device(&pdev->dev);
	if (!keypad->input_dev) {
	pr_notice("input allocate device fail.\n");
	err = -ENOMEM;
	goto err_unprepare_clk;
	}

	keypad->input_dev->name = KPD_NAME;
	keypad->input_dev->id.bustype = BUS_HOST;
	keypad->input_dev->dev.parent = &pdev->dev;

	__set_bit(EV_KEY, keypad->input_dev->evbit);

	for (i = 0; i < KPD_NUM_KEYS; i++) {
	if (keypad->hw_init_map[i])
	__set_bit(keypad->hw_init_map[i],
	keypad->input_dev->keybit);
	}

	err = input_register_device(keypad->input_dev);
	if (err) {
	pr_notice("register input device failed (%d)\n", err);
	goto err_unprepare_clk;
	}

	input_set_drvdata(keypad->input_dev, keypad);

	keypad->suspend_lock = wakeup_source_register(NULL, "kpd wakelock");
	if (!keypad->suspend_lock) {
	pr_notice("wakeup source init failed.\n");
	err = -ENOMEM;
	goto err_unregister_device;
	}

	tasklet_init(&keypad->tasklet, kpd_keymap_handler,
	(unsigned long)keypad);

	kpd_double_key_enable(keypad->base, 1);

	writew((u16)(keypad->key_debounce & KPD_DEBOUNCE_MASK),
	keypad->base + KP_DEBOUNCE);

	/* register IRQ */
	err = request_irq(keypad->irqnr, kpd_irq_handler, IRQF_TRIGGER_NONE,
	KPD_NAME, keypad);
	if (err) {
	pr_notice("register IRQ failed (%d)\n", err);
	goto err_irq;
	}

	pr_info("kpd_probe OK.\n");

	return 0;

	err_irq:
	tasklet_kill(&keypad->tasklet);
	wakeup_source_unregister(keypad->suspend_lock);

	err_unregister_device:
	input_unregister_device(keypad->input_dev);

	err_unprepare_clk:
	clk_disable_unprepare(keypad->clk);

	return err;
	}


	static int kpd_pdrv_remove(struct platform_device *pdev)
	{
	struct mtk_keypad *keypad = platform_get_drvdata(pdev);

	tasklet_kill(&keypad->tasklet);
	wakeup_source_unregister(keypad->suspend_lock);
	input_unregister_device(keypad->input_dev);
	clk_disable_unprepare(keypad->clk);

	return 0;
	}

	static const struct of_device_id kpd_of_match[] = {
	{.compatible = "mediatek,mt6779-keypad"},
	{.compatible = "mediatek,kp"},
	{},
	};

	static struct platform_driver kpd_pdrv = {
	.probe = kpd_pdrv_probe,
	.remove = kpd_pdrv_remove,
	.driver = {
	.name = KPD_NAME,
	.of_match_table = kpd_of_match,
	},
	};

	module_platform_driver(kpd_pdrv);

	MODULE_AUTHOR("Mediatek Corporation");
	MODULE_DESCRIPTION("MTK Keypad (KPD) Driver");
	MODULE_LICENSE("GPL");