Input: add Spreadtrum vibrator driver

This patch adds the Spreadtrum vibrator driver, which embedded in the
Spreadtrum SC27xx series PMICs.

Signed-off-by: Xiaotong Lu <xiaotong.lu@spreadtrum.com>
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/Documentation/devicetree/bindings/input/sprd,sc27xx-vibra.txt b/Documentation/devicetree/bindings/input/sprd,sc27xx-vibra.txt
new file mode 100644 (file)
index 0000000..f2ec0d4
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/sprd,sc27xx-vibra.txt
@@ -0,0 +1,23 @@
+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>;
+               };
+       };

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 572b15f..c761c0c 100644 (file)
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -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

diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 72cde28..9d0f9d1 100644 (file)
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -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

diff --git a/drivers/input/misc/sc27xx-vibra.c b/drivers/input/misc/sc27xx-vibra.c
new file mode 100644 (file)
index 0000000..295251a
--- /dev/null
+++ b/drivers/input/misc/sc27xx-vibra.c
@@ -0,0 +1,154 @@
+// 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>");