Input: add Spreadtrum vibrator driver (45615a9b) · Commits · 戴 / test

Documentation/devicetree/bindings/input/sprd,sc27xx-vibra.txt

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		Spreadtrum SC27xx PMIC Vibrator

		Required properties:
		- compatible: should be "sprd,sc2731-vibrator".
		- reg: address of vibrator control register.

		Example :

		sc2731_pmic: pmic@0 {
		compatible = "sprd,sc2731";
		reg = <0>;
		spi-max-frequency = <26000000>;
		interrupts = <GIC_SPI 31 IRQ_TYPE_LEVEL_HIGH>;
		interrupt-controller;
		#interrupt-cells = <2>;
		#address-cells = <1>;
		#size-cells = <0>;

		vibrator@eb4 {
		compatible = "sprd,sc2731-vibrator";
		reg = <0xeb4>;
		};
		};

drivers/input/misc/Kconfig

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		@@ -841,4 +841,14 @@ config INPUT_RAVE_SP_PWRBUTTON
		To compile this driver as a module, choose M here: the
		module will be called rave-sp-pwrbutton.

		config INPUT_SC27XX_VIBRA
		tristate "Spreadtrum sc27xx vibrator support"
		depends on MFD_SC27XX_PMIC \|\| COMPILE_TEST
		select INPUT_FF_MEMLESS
		help
		This option enables support for Spreadtrum sc27xx vibrator driver.

		To compile this driver as a module, choose M here. The module will
		be called sc27xx_vibra.

		endif

drivers/input/misc/Makefile

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		@@ -66,6 +66,7 @@ obj-$(CONFIG_INPUT_RETU_PWRBUTTON) += retu-pwrbutton.o
		obj-$(CONFIG_INPUT_AXP20X_PEK) += axp20x-pek.o
		obj-$(CONFIG_INPUT_GPIO_ROTARY_ENCODER) += rotary_encoder.o
		obj-$(CONFIG_INPUT_RK805_PWRKEY) += rk805-pwrkey.o
		obj-$(CONFIG_INPUT_SC27XX_VIBRA) += sc27xx-vibra.o
		obj-$(CONFIG_INPUT_SGI_BTNS) += sgi_btns.o
		obj-$(CONFIG_INPUT_SIRFSOC_ONKEY) += sirfsoc-onkey.o
		obj-$(CONFIG_INPUT_SOC_BUTTON_ARRAY) += soc_button_array.o

drivers/input/misc/sc27xx-vibra.c

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		// SPDX-License-Identifier: GPL-2.0
		/*
		* Copyright (C) 2018 Spreadtrum Communications Inc.
		*/

		#include <linux/module.h>
		#include <linux/of_address.h>
		#include <linux/platform_device.h>
		#include <linux/regmap.h>
		#include <linux/input.h>
		#include <linux/workqueue.h>

		#define CUR_DRV_CAL_SEL GENMASK(13, 12)
		#define SLP_LDOVIBR_PD_EN BIT(9)
		#define LDO_VIBR_PD BIT(8)

		struct vibra_info {
		struct input_dev *input_dev;
		struct work_struct play_work;
		struct regmap *regmap;
		u32 base;
		u32 strength;
		bool enabled;
		};

		static void sc27xx_vibra_set(struct vibra_info *info, bool on)
		{
		if (on) {
		regmap_update_bits(info->regmap, info->base, LDO_VIBR_PD, 0);
		regmap_update_bits(info->regmap, info->base,
		SLP_LDOVIBR_PD_EN, 0);
		info->enabled = true;
		} else {
		regmap_update_bits(info->regmap, info->base, LDO_VIBR_PD,
		LDO_VIBR_PD);
		regmap_update_bits(info->regmap, info->base,
		SLP_LDOVIBR_PD_EN, SLP_LDOVIBR_PD_EN);
		info->enabled = false;
		}
		}

		static int sc27xx_vibra_hw_init(struct vibra_info *info)
		{
		return regmap_update_bits(info->regmap, info->base, CUR_DRV_CAL_SEL, 0);
		}

		static void sc27xx_vibra_play_work(struct work_struct *work)
		{
		struct vibra_info *info = container_of(work, struct vibra_info,
		play_work);

		if (info->strength && !info->enabled)
		sc27xx_vibra_set(info, true);
		else if (info->strength == 0 && info->enabled)
		sc27xx_vibra_set(info, false);
		}

		static int sc27xx_vibra_play(struct input_dev input, void data,
		struct ff_effect *effect)
		{
		struct vibra_info *info = input_get_drvdata(input);

		info->strength = effect->u.rumble.weak_magnitude;
		schedule_work(&info->play_work);

		return 0;
		}

		static void sc27xx_vibra_close(struct input_dev *input)
		{
		struct vibra_info *info = input_get_drvdata(input);

		cancel_work_sync(&info->play_work);
		if (info->enabled)
		sc27xx_vibra_set(info, false);
		}

		static int sc27xx_vibra_probe(struct platform_device *pdev)
		{
		struct vibra_info *info;
		int error;

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

		info->regmap = dev_get_regmap(pdev->dev.parent, NULL);
		if (!info->regmap) {
		dev_err(&pdev->dev, "failed to get vibrator regmap.\n");
		return -ENODEV;
		}

		error = device_property_read_u32(&pdev->dev, "reg", &info->base);
		if (error) {
		dev_err(&pdev->dev, "failed to get vibrator base address.\n");
		return error;
		}

		info->input_dev = devm_input_allocate_device(&pdev->dev);
		if (!info->input_dev) {
		dev_err(&pdev->dev, "failed to allocate input device.\n");
		return -ENOMEM;
		}

		info->input_dev->name = "sc27xx:vibrator";
		info->input_dev->id.version = 0;
		info->input_dev->close = sc27xx_vibra_close;

		input_set_drvdata(info->input_dev, info);
		input_set_capability(info->input_dev, EV_FF, FF_RUMBLE);
		INIT_WORK(&info->play_work, sc27xx_vibra_play_work);
		info->enabled = false;

		error = sc27xx_vibra_hw_init(info);
		if (error) {
		dev_err(&pdev->dev, "failed to initialize the vibrator.\n");
		return error;
		}

		error = input_ff_create_memless(info->input_dev, NULL,
		sc27xx_vibra_play);
		if (error) {
		dev_err(&pdev->dev, "failed to register vibrator to FF.\n");
		return error;
		}

		error = input_register_device(info->input_dev);
		if (error) {
		dev_err(&pdev->dev, "failed to register input device.\n");
		return error;
		}

		return 0;
		}

		static const struct of_device_id sc27xx_vibra_of_match[] = {
		{ .compatible = "sprd,sc2731-vibrator", },
		{}
		};
		MODULE_DEVICE_TABLE(of, sc27xx_vibra_of_match);

		static struct platform_driver sc27xx_vibra_driver = {
		.driver = {
		.name = "sc27xx-vibrator",
		.of_match_table = sc27xx_vibra_of_match,
		},
		.probe = sc27xx_vibra_probe,
		};

		module_platform_driver(sc27xx_vibra_driver);

		MODULE_DESCRIPTION("Spreadtrum SC27xx Vibrator Driver");
		MODULE_LICENSE("GPL v2");
		MODULE_AUTHOR("Xiaotong Lu <xiaotong.lu@spreadtrum.com>");

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