// 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(vib) (vib->drv2_addr ? 3544 : 3100)
#define VIB_MIN_LEVEL_mV(vib) (vib->drv2_addr ? 1504 : 1200)
#define VIB_PER_STEP_mV(vib) (vib->drv2_addr ? 8 : 100)
#define VIB_MAX_LEVELS(vib) \
(VIB_MAX_LEVEL_mV(vib) - VIB_MIN_LEVEL_mV(vib) + VIB_PER_STEP_mV(vib))
#define MAX_FF_SPEED 0xff
struct pm8xxx_regs {
unsigned int enable_offset;
unsigned int enable_mask;
unsigned int drv_offset;
unsigned int drv_mask;
unsigned int drv_shift;
unsigned int drv2_offset;
unsigned int drv2_mask;
unsigned int drv2_shift;
unsigned int drv_en_manual_mask;
bool drv_in_step;
};
static const struct pm8xxx_regs pm8058_regs = {
.drv_offset = 0,
.drv_mask = GENMASK(7, 3),
.drv_shift = 3,
.drv_en_manual_mask = 0xfc,
.drv_in_step = true,
};
static struct pm8xxx_regs pm8916_regs = {
.enable_offset = 0x46,
.enable_mask = BIT(7),
.drv_offset = 0x41,
.drv_mask = GENMASK(4, 0),
.drv_shift = 0,
.drv_en_manual_mask = 0,
.drv_in_step = true,
};
static struct pm8xxx_regs pmi632_regs = {
.enable_offset = 0x46,
.enable_mask = BIT(7),
.drv_offset = 0x40,
.drv_mask = GENMASK(7, 0),
.drv_shift = 0,
.drv2_offset = 0x41,
.drv2_mask = GENMASK(3, 0),
.drv2_shift = 8,
.drv_en_manual_mask = 0,
.drv_in_step = false,
};
/**
* 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
* @enable_addr: vibrator enable register
* @drv_addr: vibrator drive strength register
* @drv2_addr: vibrator drive strength upper byte register
* @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;
unsigned int enable_addr;
unsigned int drv_addr;
unsigned int drv2_addr;
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 (regs->drv_in_step)
vib->level /= VIB_PER_STEP_mV(vib);
if (on)
val |= (vib->level << regs->drv_shift) & regs->drv_mask;
else
val &= ~regs->drv_mask;
rc = regmap_write(vib->regmap, vib->drv_addr, val);
if (rc < 0)
return rc;
vib->reg_vib_drv = val;
if (regs->drv2_mask) {
val = vib->level << regs->drv2_shift;
rc = regmap_write_bits(vib->regmap, vib->drv2_addr,
regs->drv2_mask, on ? val : 0);
if (rc < 0)
return rc;
}
if (regs->enable_mask)
rc = regmap_update_bits(vib->regmap, vib->enable_addr,
regs->enable_mask, on ? regs->enable_mask : 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);
unsigned int val;
int rc;
rc = regmap_read(vib->regmap, vib->drv_addr, &val);
if (rc < 0)
return;
/*
* pmic vibrator supports voltage ranges from MIN_LEVEL to MAX_LEVEL, so
* scale the level to fit into these ranges.
*/
if (vib->speed) {
vib->active = true;
vib->level = VIB_MIN_LEVEL_mV(vib);
vib->level += mult_frac(VIB_MAX_LEVELS(vib), vib->speed, MAX_FF_SPEED);
} else {
vib->active = false;
vib->level = VIB_MIN_LEVEL_mV(vib);
}
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, reg_base = 0;
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;
error = fwnode_property_read_u32(pdev->dev.fwnode, "reg", ®_base);
if (error < 0)
return dev_err_probe(&pdev->dev, error, "Failed to read reg address\n");
regs = of_device_get_match_data(&pdev->dev);
vib->enable_addr = reg_base + regs->enable_offset;
vib->drv_addr = reg_base + regs->drv_offset;
vib->drv2_addr = reg_base + regs->drv2_offset;
/* operate in manual mode */
error = regmap_read(vib->regmap, vib->drv_addr, &val);
if (error < 0)
return error;
val &= regs->drv_en_manual_mask;
error = regmap_write(vib->regmap, vib->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 },
{ .compatible = "qcom,pmi632-vib", .data = &pmi632_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 <[email protected]>");
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