149 lines
3.5 KiB
C
149 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Driver for TPS65219 Push Button
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//
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// Copyright (C) 2022 BayLibre Incorporated - https://www.baylibre.com/
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#include <linux/init.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/mfd/tps65219.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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struct tps65219_pwrbutton {
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struct device *dev;
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struct input_dev *idev;
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char phys[32];
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};
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static irqreturn_t tps65219_pb_push_irq(int irq, void *_pwr)
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{
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struct tps65219_pwrbutton *pwr = _pwr;
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input_report_key(pwr->idev, KEY_POWER, 1);
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pm_wakeup_event(pwr->dev, 0);
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input_sync(pwr->idev);
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return IRQ_HANDLED;
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}
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static irqreturn_t tps65219_pb_release_irq(int irq, void *_pwr)
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{
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struct tps65219_pwrbutton *pwr = _pwr;
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input_report_key(pwr->idev, KEY_POWER, 0);
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input_sync(pwr->idev);
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return IRQ_HANDLED;
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}
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static int tps65219_pb_probe(struct platform_device *pdev)
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{
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struct tps65219 *tps = dev_get_drvdata(pdev->dev.parent);
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struct device *dev = &pdev->dev;
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struct tps65219_pwrbutton *pwr;
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struct input_dev *idev;
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int error;
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int push_irq;
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int release_irq;
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pwr = devm_kzalloc(dev, sizeof(*pwr), GFP_KERNEL);
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if (!pwr)
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return -ENOMEM;
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idev = devm_input_allocate_device(dev);
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if (!idev)
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return -ENOMEM;
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idev->name = pdev->name;
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snprintf(pwr->phys, sizeof(pwr->phys), "%s/input0",
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pdev->name);
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idev->phys = pwr->phys;
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idev->id.bustype = BUS_I2C;
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input_set_capability(idev, EV_KEY, KEY_POWER);
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pwr->dev = dev;
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pwr->idev = idev;
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device_init_wakeup(dev, true);
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push_irq = platform_get_irq(pdev, 0);
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if (push_irq < 0)
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return -EINVAL;
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release_irq = platform_get_irq(pdev, 1);
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if (release_irq < 0)
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return -EINVAL;
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error = devm_request_threaded_irq(dev, push_irq, NULL,
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tps65219_pb_push_irq,
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IRQF_ONESHOT,
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dev->init_name, pwr);
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if (error) {
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dev_err(dev, "failed to request push IRQ #%d: %d\n", push_irq,
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error);
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return error;
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}
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error = devm_request_threaded_irq(dev, release_irq, NULL,
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tps65219_pb_release_irq,
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IRQF_ONESHOT,
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dev->init_name, pwr);
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if (error) {
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dev_err(dev, "failed to request release IRQ #%d: %d\n",
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release_irq, error);
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return error;
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}
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error = input_register_device(idev);
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if (error) {
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dev_err(dev, "Can't register power button: %d\n", error);
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return error;
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}
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/* Enable interrupts for the pushbutton */
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regmap_clear_bits(tps->regmap, TPS65219_REG_MASK_CONFIG,
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TPS65219_REG_MASK_INT_FOR_PB_MASK);
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/* Set PB/EN/VSENSE pin to be a pushbutton */
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regmap_update_bits(tps->regmap, TPS65219_REG_MFP_2_CONFIG,
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TPS65219_MFP_2_EN_PB_VSENSE_MASK, TPS65219_MFP_2_PB);
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return 0;
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}
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static int tps65219_pb_remove(struct platform_device *pdev)
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{
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struct tps65219 *tps = dev_get_drvdata(pdev->dev.parent);
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/* Disable interrupt for the pushbutton */
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return regmap_update_bits(tps->regmap, TPS65219_REG_MASK_CONFIG,
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TPS65219_REG_MASK_INT_FOR_PB_MASK,
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TPS65219_REG_MASK_INT_FOR_PB_MASK);
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}
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static const struct platform_device_id tps65219_pwrbtn_id_table[] = {
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{ "tps65219-pwrbutton", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(platform, tps65219_pwrbtn_id_table);
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static struct platform_driver tps65219_pb_driver = {
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.probe = tps65219_pb_probe,
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.remove = tps65219_pb_remove,
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.driver = {
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.name = "tps65219_pwrbutton",
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},
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.id_table = tps65219_pwrbtn_id_table,
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};
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module_platform_driver(tps65219_pb_driver);
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MODULE_DESCRIPTION("TPS65219 Power Button");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Markus Schneider-Pargmann <msp@baylibre.com");
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