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path: root/drivers/input/misc/sc27xx-vibra.c
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Diffstat (limited to 'drivers/input/misc/sc27xx-vibra.c')
-rw-r--r--drivers/input/misc/sc27xx-vibra.c201
1 files changed, 201 insertions, 0 deletions
diff --git a/drivers/input/misc/sc27xx-vibra.c b/drivers/input/misc/sc27xx-vibra.c
new file mode 100644
index 000000000..1478017f0
--- /dev/null
+++ b/drivers/input/misc/sc27xx-vibra.c
@@ -0,0 +1,201 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 Spreadtrum Communications Inc.
+ */
+
+#include <linux/device.h>
+#include <linux/input.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regmap.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)
+#define SC2730_CUR_DRV_CAL_SEL 0
+#define SC2730_SLP_LDOVIBR_PD_EN BIT(14)
+#define SC2730_LDO_VIBR_PD BIT(13)
+
+struct sc27xx_vibra_data {
+ u32 cur_drv_cal_sel;
+ u32 slp_pd_en;
+ u32 ldo_pd;
+};
+
+struct vibra_info {
+ struct input_dev *input_dev;
+ struct work_struct play_work;
+ struct regmap *regmap;
+ const struct sc27xx_vibra_data *data;
+ u32 base;
+ u32 strength;
+ bool enabled;
+};
+
+static const struct sc27xx_vibra_data sc2731_data = {
+ .cur_drv_cal_sel = CUR_DRV_CAL_SEL,
+ .slp_pd_en = SLP_LDOVIBR_PD_EN,
+ .ldo_pd = LDO_VIBR_PD,
+};
+
+static const struct sc27xx_vibra_data sc2730_data = {
+ .cur_drv_cal_sel = SC2730_CUR_DRV_CAL_SEL,
+ .slp_pd_en = SC2730_SLP_LDOVIBR_PD_EN,
+ .ldo_pd = SC2730_LDO_VIBR_PD,
+};
+
+static const struct sc27xx_vibra_data sc2721_data = {
+ .cur_drv_cal_sel = CUR_DRV_CAL_SEL,
+ .slp_pd_en = SLP_LDOVIBR_PD_EN,
+ .ldo_pd = LDO_VIBR_PD,
+};
+
+static void sc27xx_vibra_set(struct vibra_info *info, bool on)
+{
+ const struct sc27xx_vibra_data *data = info->data;
+ if (on) {
+ regmap_update_bits(info->regmap, info->base, data->ldo_pd, 0);
+ regmap_update_bits(info->regmap, info->base,
+ data->slp_pd_en, 0);
+ info->enabled = true;
+ } else {
+ regmap_update_bits(info->regmap, info->base, data->ldo_pd,
+ data->ldo_pd);
+ regmap_update_bits(info->regmap, info->base,
+ data->slp_pd_en, data->slp_pd_en);
+ info->enabled = false;
+ }
+}
+
+static int sc27xx_vibra_hw_init(struct vibra_info *info)
+{
+ const struct sc27xx_vibra_data *data = info->data;
+
+ if (!data->cur_drv_cal_sel)
+ return 0;
+
+ return regmap_update_bits(info->regmap, info->base,
+ data->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;
+ const struct sc27xx_vibra_data *data;
+ int error;
+
+ data = device_get_match_data(&pdev->dev);
+ if (!data) {
+ dev_err(&pdev->dev, "no matching driver data found\n");
+ return -EINVAL;
+ }
+
+ 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;
+ info->data = data;
+
+ 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,sc2721-vibrator", .data = &sc2721_data },
+ { .compatible = "sprd,sc2730-vibrator", .data = &sc2730_data },
+ { .compatible = "sprd,sc2731-vibrator", .data = &sc2731_data },
+ {}
+};
+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>");