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/*
* Qualcomm MSM vibrator driver
*
* Copyright (c) 2018 Brian Masney <masneyb@onstation.org>
*
* Based on qcom,pwm-vibrator.c from:
* Copyright (c) 2018 Jonathan Marek <jonathan@marek.ca>
*
* Based on msm_pwm_vibrator.c from downstream Android sources:
* Copyright (C) 2009-2014 LGE, Inc.
*/
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/input.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#define REG_CMD_RCGR 0x00
#define REG_CFG_RCGR 0x04
#define REG_M 0x08
#define REG_N 0x0C
#define REG_D 0x10
#define REG_CBCR 0x24
#define MMSS_CC_M_DEFAULT 1
struct msm_vibrator {
struct input_dev *input;
struct mutex mutex;
struct work_struct worker;
void __iomem *base;
struct regulator *vcc;
struct clk *clk;
struct gpio_desc *enable_gpio;
u16 magnitude;
bool enabled;
};
static void msm_vibrator_write(struct msm_vibrator *vibrator, int offset,
u32 value)
{
writel(value, vibrator->base + offset);
}
static int msm_vibrator_start(struct msm_vibrator *vibrator)
{
int d_reg_val, ret = 0;
mutex_lock(&vibrator->mutex);
if (!vibrator->enabled) {
ret = clk_set_rate(vibrator->clk, 24000);
if (ret) {
dev_err(&vibrator->input->dev,
"Failed to set clock rate: %d\n", ret);
goto unlock;
}
ret = clk_prepare_enable(vibrator->clk);
if (ret) {
dev_err(&vibrator->input->dev,
"Failed to enable clock: %d\n", ret);
goto unlock;
}
ret = regulator_enable(vibrator->vcc);
if (ret) {
dev_err(&vibrator->input->dev,
"Failed to enable regulator: %d\n", ret);
clk_disable(vibrator->clk);
goto unlock;
}
gpiod_set_value_cansleep(vibrator->enable_gpio, 1);
vibrator->enabled = true;
}
d_reg_val = 127 - ((126 * vibrator->magnitude) / 0xffff);
msm_vibrator_write(vibrator, REG_CFG_RCGR,
(2 << 12) | /* dual edge mode */
(0 << 8) | /* cxo */
(7 << 0));
msm_vibrator_write(vibrator, REG_M, 1);
msm_vibrator_write(vibrator, REG_N, 128);
msm_vibrator_write(vibrator, REG_D, d_reg_val);
msm_vibrator_write(vibrator, REG_CMD_RCGR, 1);
msm_vibrator_write(vibrator, REG_CBCR, 1);
unlock:
mutex_unlock(&vibrator->mutex);
return ret;
}
static void msm_vibrator_stop(struct msm_vibrator *vibrator)
{
mutex_lock(&vibrator->mutex);
if (vibrator->enabled) {
gpiod_set_value_cansleep(vibrator->enable_gpio, 0);
regulator_disable(vibrator->vcc);
clk_disable(vibrator->clk);
vibrator->enabled = false;
}
mutex_unlock(&vibrator->mutex);
}
static void msm_vibrator_worker(struct work_struct *work)
{
struct msm_vibrator *vibrator = container_of(work,
struct msm_vibrator,
worker);
if (vibrator->magnitude)
msm_vibrator_start(vibrator);
else
msm_vibrator_stop(vibrator);
}
static int msm_vibrator_play_effect(struct input_dev *dev, void *data,
struct ff_effect *effect)
{
struct msm_vibrator *vibrator = input_get_drvdata(dev);
mutex_lock(&vibrator->mutex);
if (effect->u.rumble.strong_magnitude > 0)
vibrator->magnitude = effect->u.rumble.strong_magnitude;
else
vibrator->magnitude = effect->u.rumble.weak_magnitude;
mutex_unlock(&vibrator->mutex);
schedule_work(&vibrator->worker);
return 0;
}
static void msm_vibrator_close(struct input_dev *input)
{
struct msm_vibrator *vibrator = input_get_drvdata(input);
cancel_work_sync(&vibrator->worker);
msm_vibrator_stop(vibrator);
}
static int msm_vibrator_probe(struct platform_device *pdev)
{
struct msm_vibrator *vibrator;
struct resource *res;
int ret;
vibrator = devm_kzalloc(&pdev->dev, sizeof(*vibrator), GFP_KERNEL);
if (!vibrator)
return -ENOMEM;
vibrator->input = devm_input_allocate_device(&pdev->dev);
if (!vibrator->input)
return -ENOMEM;
vibrator->vcc = devm_regulator_get(&pdev->dev, "vcc");
if (IS_ERR(vibrator->vcc)) {
if (PTR_ERR(vibrator->vcc) != -EPROBE_DEFER)
dev_err(&pdev->dev, "Failed to get regulator: %ld\n",
PTR_ERR(vibrator->vcc));
return PTR_ERR(vibrator->vcc);
}
vibrator->enable_gpio = devm_gpiod_get(&pdev->dev, "enable",
GPIOD_OUT_LOW);
if (IS_ERR(vibrator->enable_gpio)) {
if (PTR_ERR(vibrator->enable_gpio) != -EPROBE_DEFER)
dev_err(&pdev->dev, "Failed to get enable gpio: %ld\n",
PTR_ERR(vibrator->enable_gpio));
return PTR_ERR(vibrator->enable_gpio);
}
vibrator->clk = devm_clk_get(&pdev->dev, "pwm");
if (IS_ERR(vibrator->clk)) {
if (PTR_ERR(vibrator->clk) != -EPROBE_DEFER)
dev_err(&pdev->dev, "Failed to lookup pwm clock: %ld\n",
PTR_ERR(vibrator->clk));
return PTR_ERR(vibrator->clk);
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "Failed to get platform resource\n");
return -ENODEV;
}
vibrator->base = devm_ioremap(&pdev->dev, res->start,
resource_size(res));
if (!vibrator->base) {
dev_err(&pdev->dev, "Failed to iomap resource.\n");
return -ENOMEM;
}
vibrator->enabled = false;
mutex_init(&vibrator->mutex);
INIT_WORK(&vibrator->worker, msm_vibrator_worker);
vibrator->input->name = "msm-vibrator";
vibrator->input->id.bustype = BUS_HOST;
vibrator->input->close = msm_vibrator_close;
input_set_drvdata(vibrator->input, vibrator);
input_set_capability(vibrator->input, EV_FF, FF_RUMBLE);
ret = input_ff_create_memless(vibrator->input, NULL,
msm_vibrator_play_effect);
if (ret) {
dev_err(&pdev->dev, "Failed to create ff memless: %d", ret);
return ret;
}
ret = input_register_device(vibrator->input);
if (ret) {
dev_err(&pdev->dev, "Failed to register input device: %d", ret);
return ret;
}
platform_set_drvdata(pdev, vibrator);
return 0;
}
static int __maybe_unused msm_vibrator_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct msm_vibrator *vibrator = platform_get_drvdata(pdev);
cancel_work_sync(&vibrator->worker);
if (vibrator->enabled)
msm_vibrator_stop(vibrator);
return 0;
}
static int __maybe_unused msm_vibrator_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct msm_vibrator *vibrator = platform_get_drvdata(pdev);
if (vibrator->enabled)
msm_vibrator_start(vibrator);
return 0;
}
static SIMPLE_DEV_PM_OPS(msm_vibrator_pm_ops, msm_vibrator_suspend,
msm_vibrator_resume);
static const struct of_device_id msm_vibrator_of_match[] = {
{ .compatible = "qcom,msm8226-vibrator" },
{ .compatible = "qcom,msm8974-vibrator" },
{},
};
MODULE_DEVICE_TABLE(of, msm_vibrator_of_match);
static struct platform_driver msm_vibrator_driver = {
.probe = msm_vibrator_probe,
.driver = {
.name = "msm-vibrator",
.pm = &msm_vibrator_pm_ops,
.of_match_table = of_match_ptr(msm_vibrator_of_match),
},
};
module_platform_driver(msm_vibrator_driver);
MODULE_AUTHOR("Brian Masney <masneyb@onstation.org>");
MODULE_DESCRIPTION("Qualcomm MSM vibrator driver");
MODULE_LICENSE("GPL");
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