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    Subject[PATCH v2 4/4] input: misc: Add Gateworks System Controller support
    Date
    Add support for dispatching Linux Input events for the various interrupts
    the Gateworks System Controller provides.

    Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
    Signed-off-by: Tim Harvey <tharvey@gateworks.com>
    ---
    v2:
    - reword Kconfig
    - revise license comment block
    - remove unnecessary read of status register
    - remove unnecessary setting of input->dev.parent
    - use dt bindings for irq to keycode mapping
    - add support for platform-data
    - remove work-queue

    drivers/input/misc/Kconfig | 9 ++
    drivers/input/misc/Makefile | 1 +
    drivers/input/misc/gsc-input.c | 180 ++++++++++++++++++++++++++++++++
    include/linux/platform_data/gsc_input.h | 30 ++++++
    4 files changed, 220 insertions(+)
    create mode 100644 drivers/input/misc/gsc-input.c
    create mode 100644 include/linux/platform_data/gsc_input.h

    diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
    index 9f082a3..e05f4fe 100644
    --- a/drivers/input/misc/Kconfig
    +++ b/drivers/input/misc/Kconfig
    @@ -117,6 +117,15 @@ config INPUT_E3X0_BUTTON
    To compile this driver as a module, choose M here: the
    module will be called e3x0_button.

    +config INPUT_GSC
    + tristate "Gateworks System Controller input support"
    + depends on MFD_GSC
    + help
    + Support GSC events as Linux input events.
    +
    + To compile this driver as a module, choose M here: the
    + module will be called gsc_input.
    +
    config INPUT_PCSPKR
    tristate "PC Speaker support"
    depends on PCSPKR_PLATFORM
    diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
    index 4b6118d..969debe 100644
    --- a/drivers/input/misc/Makefile
    +++ b/drivers/input/misc/Makefile
    @@ -38,6 +38,7 @@ obj-$(CONFIG_INPUT_GP2A) += gp2ap002a00f.o
    obj-$(CONFIG_INPUT_GPIO_BEEPER) += gpio-beeper.o
    obj-$(CONFIG_INPUT_GPIO_TILT_POLLED) += gpio_tilt_polled.o
    obj-$(CONFIG_INPUT_GPIO_DECODER) += gpio_decoder.o
    +obj-$(CONFIG_INPUT_GSC) += gsc-input.o
    obj-$(CONFIG_INPUT_HISI_POWERKEY) += hisi_powerkey.o
    obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o
    obj-$(CONFIG_INPUT_IMS_PCU) += ims-pcu.o
    diff --git a/drivers/input/misc/gsc-input.c b/drivers/input/misc/gsc-input.c
    new file mode 100644
    index 0000000..27b5e93
    --- /dev/null
    +++ b/drivers/input/misc/gsc-input.c
    @@ -0,0 +1,180 @@
    +/* SPDX-License-Identifier: GPL-2.0
    + *
    + * Copyright (C) 2018 Gateworks Corporation
    + *
    + * This driver dispatches Linux input events for GSC interrupt events
    + */
    +#include <linux/input.h>
    +#include <linux/interrupt.h>
    +#include <linux/kernel.h>
    +#include <linux/module.h>
    +#include <linux/of.h>
    +#include <linux/of_irq.h>
    +#include <linux/platform_device.h>
    +#include <linux/regmap.h>
    +
    +#include <linux/mfd/gsc.h>
    +#include <linux/platform_data/gsc_input.h>
    +
    +struct gsc_input_button_priv {
    + struct input_dev *input;
    + const struct gsc_input_button *button;
    +};
    +
    +struct gsc_input_data {
    + struct gsc_dev *gsc;
    + struct gsc_input_platform_data *pdata;
    + struct input_dev *input;
    + struct gsc_input_button_priv *buttons;
    + int nbuttons;
    + unsigned int irqs[];
    +#if 0
    + int irq;
    + struct work_struct irq_work;
    + struct mutex mutex;
    +#endif
    +};
    +
    +static irqreturn_t gsc_input_irq(int irq, void *data)
    +{
    + const struct gsc_input_button_priv *button_priv = data;
    + struct input_dev *input = button_priv->input;
    +
    + dev_dbg(&input->dev, "irq%d code=%d\n", irq, button_priv->button->code);
    + input_report_key(input, button_priv->button->code, 1);
    + input_sync(input);
    + input_report_key(input, button_priv->button->code, 0);
    + input_sync(input);
    +
    + return IRQ_HANDLED;
    +}
    +
    +static struct gsc_input_platform_data *
    +gsc_input_get_devtree_pdata(struct device *dev)
    +{
    + struct gsc_input_platform_data *pdata;
    + struct fwnode_handle *child;
    + struct gsc_input_button *button;
    + int nbuttons;
    +
    + nbuttons = device_get_child_node_count(dev);
    + dev_dbg(dev, "buttons=%d\n", nbuttons);
    + if (nbuttons == 0)
    + return ERR_PTR(-ENODEV);
    +
    + pdata = devm_kzalloc(dev,
    + sizeof(*pdata) + nbuttons * sizeof(*button),
    + GFP_KERNEL);
    + if (!pdata)
    + return ERR_PTR(-ENOMEM);
    +
    + button = (struct gsc_input_button *)(pdata + 1);
    + pdata->buttons = button;
    + pdata->nbuttons = nbuttons;
    +
    + device_property_read_string(dev, "label", &pdata->name);
    +
    + device_for_each_child_node(dev, child) {
    + if (is_of_node(child))
    + button->irq = irq_of_parse_and_map(to_of_node(child),
    + 0);
    + if (fwnode_property_read_u32(child, "linux,code",
    + &button->code)) {
    + dev_err(dev, "Button without keycode\n");
    + fwnode_handle_put(child);
    + return ERR_PTR(-EINVAL);
    + }
    + fwnode_property_read_string(child, "label", &button->desc);
    + button++;
    + }
    +
    + return pdata;
    +}
    +
    +static int gsc_input_probe(struct platform_device *pdev)
    +{
    + struct gsc_dev *gsc = dev_get_drvdata(pdev->dev.parent);
    + struct device *dev = &pdev->dev;
    + struct gsc_input_platform_data *pdata = dev_get_platdata(dev);
    + struct gsc_input_data *input;
    + int i, ret;
    +
    + if (!pdata) {
    + pdata = gsc_input_get_devtree_pdata(dev);
    + if (IS_ERR(pdata))
    + return PTR_ERR(pdata);
    + }
    +
    + input = devm_kzalloc(dev, sizeof(*input), GFP_KERNEL);
    + if (!input)
    + return -ENOMEM;
    + input->gsc = gsc;
    + input->pdata = pdata;
    +
    + input->buttons = devm_kzalloc(dev, pdata->nbuttons *
    + sizeof(struct gsc_input_button_priv),
    + GFP_KERNEL);
    + if (!input->buttons)
    + return -ENOMEM;
    +
    + /* Register input device */
    + input->input = devm_input_allocate_device(dev);
    + if (!input->input) {
    + dev_err(dev, "Can't allocate input device\n");
    + return -ENOMEM;
    + }
    + input->input->name = pdata->name ? : pdev->name;
    +
    + platform_set_drvdata(pdev, gsc);
    +
    + for (i = 0; i < pdata->nbuttons; i++) {
    + const struct gsc_input_button *button = &pdata->buttons[i];
    + struct gsc_input_button_priv *button_priv = &input->buttons[i];
    +
    + button_priv = &input->buttons[i];
    + button_priv->button = &pdata->buttons[i];
    + button_priv->input = input->input;
    + input_set_capability(input->input, EV_KEY, button->code);
    +
    + ret = devm_request_threaded_irq(dev, button->irq, NULL,
    + gsc_input_irq, 0,
    + button->desc,
    + button_priv);
    + if (ret) {
    + dev_err(dev, "irq%d request failed: %d\n)", button->irq,
    + ret);
    + return ret;
    + }
    + dev_dbg(dev, "button: irq%d/%d code=%d %s\n",
    + button->irq - pdata->buttons[0].irq,
    + button->irq,
    + button->code, button->desc);
    + }
    +
    + ret = input_register_device(input->input);
    + if (ret < 0) {
    + dev_err(dev, "Can't register input device: %d\n", ret);
    + return ret;
    + }
    +
    + return 0;
    +}
    +
    +static const struct of_device_id gsc_input_dt_ids[] = {
    + { .compatible = "gw,gsc-input", },
    + {}
    +};
    +
    +static struct platform_driver gsc_input_driver = {
    + .driver = {
    + .name = KBUILD_MODNAME,
    + .of_match_table = gsc_input_dt_ids,
    + },
    + .probe = gsc_input_probe,
    +};
    +
    +module_platform_driver(gsc_input_driver);
    +
    +MODULE_AUTHOR("Tim Harvey <tharvey@gateworks.com>");
    +MODULE_DESCRIPTION("GSC input driver");
    +MODULE_LICENSE("GPL v2");
    diff --git a/include/linux/platform_data/gsc_input.h b/include/linux/platform_data/gsc_input.h
    new file mode 100644
    index 0000000..1a34284
    --- /dev/null
    +++ b/include/linux/platform_data/gsc_input.h
    @@ -0,0 +1,30 @@
    +/* SPDX-License-Identifier: GPL-2.0 */
    +#ifndef _GSC_INPUT_H
    +#define _GSC_INPUT_H
    +
    +/**
    + * struct gsc_input_button - configuration parameters
    + * @code: input event code (KEY_*, SW_*)
    + * @irq: irq index
    + * @desc: name of interrupt
    + */
    +struct gsc_input_button {
    + unsigned int irq;
    + unsigned int code;
    + const char *desc;
    +};
    +
    +/**
    + * struct gsc_input_platform_data - platform data for gsc_input driver
    + * @buttons: pointer to array of gsc_input_button structures
    + * describing buttons mapped to interrupt events
    + * @nbuttons: number of elements in @buttons array
    + * @name: input device name
    + */
    +struct gsc_input_platform_data {
    + const struct gsc_input_button *buttons;
    + int nbuttons;
    + const char *name;
    +};
    +
    +#endif
    --
    2.7.4
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