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SubjectRe: [PATCH v4 2/3] Input: add new vibrator driver for various MSM SOCs
On Tue, Feb 05, 2019 at 08:33:28PM -0500, Brian Masney wrote:
> This patch adds a new vibrator driver that supports various Qualcomm
> MSM SOCs. Driver was tested on a LG Nexus 5 (hammerhead) phone.
>
> Signed-off-by: Brian Masney <masneyb@onstation.org>

Applied together with binding patch, thank you.

> ---
> Changes since v3:
> - Made msm_vibrator_write a function instead of a macro.
> - Check for -EPROBE_DEFER for gpio and clk for consistency with the
> regulator.
> - Check for NULL return value from devm_ioremap() instead of using
> IS_ERR()
> - Don't set dev.parent
> - Use platform_get_drvdata() in suspend and resume
>
> drivers/input/misc/Kconfig | 10 ++
> drivers/input/misc/Makefile | 1 +
> drivers/input/misc/msm-vibrator.c | 282 ++++++++++++++++++++++++++++++
> 3 files changed, 293 insertions(+)
> create mode 100644 drivers/input/misc/msm-vibrator.c
>
> diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
> index ca59a2be9bc5..e39aef84f357 100644
> --- a/drivers/input/misc/Kconfig
> +++ b/drivers/input/misc/Kconfig
> @@ -117,6 +117,16 @@ config INPUT_E3X0_BUTTON
> To compile this driver as a module, choose M here: the
> module will be called e3x0_button.
>
> +config INPUT_MSM_VIBRATOR
> + tristate "Qualcomm MSM vibrator driver"
> + select INPUT_FF_MEMLESS
> + help
> + Support for the vibrator that is found on various Qualcomm MSM
> + SOCs.
> +
> + To compile this driver as a module, choose M here: the module
> + will be called msm_vibrator.
> +
> config INPUT_PCSPKR
> tristate "PC Speaker support"
> depends on PCSPKR_PLATFORM
> diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
> index 9d0f9d1ff68f..96a6419cb1f2 100644
> --- a/drivers/input/misc/Makefile
> +++ b/drivers/input/misc/Makefile
> @@ -48,6 +48,7 @@ obj-$(CONFIG_INPUT_MAX8925_ONKEY) += max8925_onkey.o
> obj-$(CONFIG_INPUT_MAX8997_HAPTIC) += max8997_haptic.o
> obj-$(CONFIG_INPUT_MC13783_PWRBUTTON) += mc13783-pwrbutton.o
> obj-$(CONFIG_INPUT_MMA8450) += mma8450.o
> +obj-$(CONFIG_INPUT_MSM_VIBRATOR) += msm-vibrator.o
> obj-$(CONFIG_INPUT_PALMAS_PWRBUTTON) += palmas-pwrbutton.o
> obj-$(CONFIG_INPUT_PCAP) += pcap_keys.o
> obj-$(CONFIG_INPUT_PCF50633_PMU) += pcf50633-input.o
> diff --git a/drivers/input/misc/msm-vibrator.c b/drivers/input/misc/msm-vibrator.c
> new file mode 100644
> index 000000000000..c06941021447
> --- /dev/null
> +++ b/drivers/input/misc/msm-vibrator.c
> @@ -0,0 +1,282 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * 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.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: %ld\n",
> + PTR_ERR(vibrator->base));
> + 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");
> --
> 2.17.2
>

--
Dmitry

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