diff options
Diffstat (limited to 'drivers/input/misc/pm8xxx-vibrator.c')
| -rw-r--r-- | drivers/input/misc/pm8xxx-vibrator.c | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/drivers/input/misc/pm8xxx-vibrator.c b/drivers/input/misc/pm8xxx-vibrator.c new file mode 100644 index 0000000000..5c288fe7ac --- /dev/null +++ b/drivers/input/misc/pm8xxx-vibrator.c @@ -0,0 +1,261 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. + */ + +#include <linux/errno.h> +#include <linux/input.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/slab.h> + +#define VIB_MAX_LEVEL_mV (3100) +#define VIB_MIN_LEVEL_mV (1200) +#define VIB_MAX_LEVELS (VIB_MAX_LEVEL_mV - VIB_MIN_LEVEL_mV) + +#define MAX_FF_SPEED 0xff + +struct pm8xxx_regs { + unsigned int enable_addr; + unsigned int enable_mask; + + unsigned int drv_addr; + unsigned int drv_mask; + unsigned int drv_shift; + unsigned int drv_en_manual_mask; +}; + +static const struct pm8xxx_regs pm8058_regs = { + .drv_addr = 0x4A, + .drv_mask = 0xf8, + .drv_shift = 3, + .drv_en_manual_mask = 0xfc, +}; + +static struct pm8xxx_regs pm8916_regs = { + .enable_addr = 0xc046, + .enable_mask = BIT(7), + .drv_addr = 0xc041, + .drv_mask = 0x1F, + .drv_shift = 0, + .drv_en_manual_mask = 0, +}; + +/** + * struct pm8xxx_vib - structure to hold vibrator data + * @vib_input_dev: input device supporting force feedback + * @work: work structure to set the vibration parameters + * @regmap: regmap for register read/write + * @regs: registers' info + * @speed: speed of vibration set from userland + * @active: state of vibrator + * @level: level of vibration to set in the chip + * @reg_vib_drv: regs->drv_addr register value + */ +struct pm8xxx_vib { + struct input_dev *vib_input_dev; + struct work_struct work; + struct regmap *regmap; + const struct pm8xxx_regs *regs; + int speed; + int level; + bool active; + u8 reg_vib_drv; +}; + +/** + * pm8xxx_vib_set - handler to start/stop vibration + * @vib: pointer to vibrator structure + * @on: state to set + */ +static int pm8xxx_vib_set(struct pm8xxx_vib *vib, bool on) +{ + int rc; + unsigned int val = vib->reg_vib_drv; + const struct pm8xxx_regs *regs = vib->regs; + + if (on) + val |= (vib->level << regs->drv_shift) & regs->drv_mask; + else + val &= ~regs->drv_mask; + + rc = regmap_write(vib->regmap, regs->drv_addr, val); + if (rc < 0) + return rc; + + vib->reg_vib_drv = val; + + if (regs->enable_mask) + rc = regmap_update_bits(vib->regmap, regs->enable_addr, + regs->enable_mask, on ? ~0 : 0); + + return rc; +} + +/** + * pm8xxx_work_handler - worker to set vibration level + * @work: pointer to work_struct + */ +static void pm8xxx_work_handler(struct work_struct *work) +{ + struct pm8xxx_vib *vib = container_of(work, struct pm8xxx_vib, work); + const struct pm8xxx_regs *regs = vib->regs; + int rc; + unsigned int val; + + rc = regmap_read(vib->regmap, regs->drv_addr, &val); + if (rc < 0) + return; + + /* + * pmic vibrator supports voltage ranges from 1.2 to 3.1V, so + * scale the level to fit into these ranges. + */ + if (vib->speed) { + vib->active = true; + vib->level = ((VIB_MAX_LEVELS * vib->speed) / MAX_FF_SPEED) + + VIB_MIN_LEVEL_mV; + vib->level /= 100; + } else { + vib->active = false; + vib->level = VIB_MIN_LEVEL_mV / 100; + } + + pm8xxx_vib_set(vib, vib->active); +} + +/** + * pm8xxx_vib_close - callback of input close callback + * @dev: input device pointer + * + * Turns off the vibrator. + */ +static void pm8xxx_vib_close(struct input_dev *dev) +{ + struct pm8xxx_vib *vib = input_get_drvdata(dev); + + cancel_work_sync(&vib->work); + if (vib->active) + pm8xxx_vib_set(vib, false); +} + +/** + * pm8xxx_vib_play_effect - function to handle vib effects. + * @dev: input device pointer + * @data: data of effect + * @effect: effect to play + * + * Currently this driver supports only rumble effects. + */ +static int pm8xxx_vib_play_effect(struct input_dev *dev, void *data, + struct ff_effect *effect) +{ + struct pm8xxx_vib *vib = input_get_drvdata(dev); + + vib->speed = effect->u.rumble.strong_magnitude >> 8; + if (!vib->speed) + vib->speed = effect->u.rumble.weak_magnitude >> 9; + + schedule_work(&vib->work); + + return 0; +} + +static int pm8xxx_vib_probe(struct platform_device *pdev) +{ + struct pm8xxx_vib *vib; + struct input_dev *input_dev; + int error; + unsigned int val; + const struct pm8xxx_regs *regs; + + vib = devm_kzalloc(&pdev->dev, sizeof(*vib), GFP_KERNEL); + if (!vib) + return -ENOMEM; + + vib->regmap = dev_get_regmap(pdev->dev.parent, NULL); + if (!vib->regmap) + return -ENODEV; + + input_dev = devm_input_allocate_device(&pdev->dev); + if (!input_dev) + return -ENOMEM; + + INIT_WORK(&vib->work, pm8xxx_work_handler); + vib->vib_input_dev = input_dev; + + regs = of_device_get_match_data(&pdev->dev); + + /* operate in manual mode */ + error = regmap_read(vib->regmap, regs->drv_addr, &val); + if (error < 0) + return error; + + val &= regs->drv_en_manual_mask; + error = regmap_write(vib->regmap, regs->drv_addr, val); + if (error < 0) + return error; + + vib->regs = regs; + vib->reg_vib_drv = val; + + input_dev->name = "pm8xxx_vib_ffmemless"; + input_dev->id.version = 1; + input_dev->close = pm8xxx_vib_close; + input_set_drvdata(input_dev, vib); + input_set_capability(vib->vib_input_dev, EV_FF, FF_RUMBLE); + + error = input_ff_create_memless(input_dev, NULL, + pm8xxx_vib_play_effect); + if (error) { + dev_err(&pdev->dev, + "couldn't register vibrator as FF device\n"); + return error; + } + + error = input_register_device(input_dev); + if (error) { + dev_err(&pdev->dev, "couldn't register input device\n"); + return error; + } + + platform_set_drvdata(pdev, vib); + return 0; +} + +static int pm8xxx_vib_suspend(struct device *dev) +{ + struct pm8xxx_vib *vib = dev_get_drvdata(dev); + + /* Turn off the vibrator */ + pm8xxx_vib_set(vib, false); + + return 0; +} + +static DEFINE_SIMPLE_DEV_PM_OPS(pm8xxx_vib_pm_ops, pm8xxx_vib_suspend, NULL); + +static const struct of_device_id pm8xxx_vib_id_table[] = { + { .compatible = "qcom,pm8058-vib", .data = &pm8058_regs }, + { .compatible = "qcom,pm8921-vib", .data = &pm8058_regs }, + { .compatible = "qcom,pm8916-vib", .data = &pm8916_regs }, + { } +}; +MODULE_DEVICE_TABLE(of, pm8xxx_vib_id_table); + +static struct platform_driver pm8xxx_vib_driver = { + .probe = pm8xxx_vib_probe, + .driver = { + .name = "pm8xxx-vib", + .pm = pm_sleep_ptr(&pm8xxx_vib_pm_ops), + .of_match_table = pm8xxx_vib_id_table, + }, +}; +module_platform_driver(pm8xxx_vib_driver); + +MODULE_ALIAS("platform:pm8xxx_vib"); +MODULE_DESCRIPTION("PMIC8xxx vibrator driver based on ff-memless framework"); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Amy Maloche <amaloche@codeaurora.org>"); |