diff options
Diffstat (limited to 'drivers/input/misc/sc27xx-vibra.c')
| -rw-r--r-- | drivers/input/misc/sc27xx-vibra.c | 201 |
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>"); |