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| 2 | |
| 3 | * power button driver for TI TPS6594 PMICs
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| 4 | *
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| 5 | * Copyright (C) 2025 Critical Link LLC - https://www.criticallink.com/
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| 6 |
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| 7 | #include <linux/init.h>
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| 8 | #include <linux/input.h>
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| 9 | #include <linux/interrupt.h>
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| 10 | #include <linux/kernel.h>
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| 11 | #include <linux/mfd/tps6594.h>
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| 12 | #include <linux/module.h>
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| 13 | #include <linux/platform_device.h>
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| 14 | #include <linux/regmap.h>
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| 15 | #include <linux/slab.h>
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| 16 |
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| 17 | struct tps6594_pwrbutton {
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| 18 | struct device *dev;
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| 19 | struct input_dev *idev;
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| 20 | char phys[32];
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| 21 | };
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| 22 |
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| 23 | static irqreturn_t tps6594_pb_push_irq(int irq, void *_pwr)
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| 24 | {
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| 25 | struct tps6594_pwrbutton *pwr = _pwr;
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| 26 |
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| 27 | input_report_key(pwr->idev, KEY_POWER, 1);
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| 28 | pm_wakeup_event(pwr->dev, 0);
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| 29 | input_sync(pwr->idev);
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| 30 |
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| 31 | return IRQ_HANDLED;
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| 32 | }
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| 33 |
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| 34 | static irqreturn_t tps6594_pb_release_irq(int irq, void *_pwr)
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| 35 | {
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| 36 | struct tps6594_pwrbutton *pwr = _pwr;
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| 37 |
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| 38 | input_report_key(pwr->idev, KEY_POWER, 0);
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| 39 | input_sync(pwr->idev);
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| 40 |
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| 41 | return IRQ_HANDLED;
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| 42 | }
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| 43 |
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| 44 | static int tps6594_pb_probe(struct platform_device *pdev)
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| 45 | {
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| 46 | struct device *dev = &pdev->dev;
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| 47 | struct tps6594_pwrbutton *pwr;
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| 48 | struct input_dev *idev;
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| 49 | int error;
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| 50 | int push_irq;
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| 51 | int release_irq;
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| 52 |
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| 53 | pwr = devm_kzalloc(dev, sizeof(*pwr), GFP_KERNEL);
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| 54 | if (!pwr)
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| 55 | return -ENOMEM;
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| 56 |
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| 57 | idev = devm_input_allocate_device(dev);
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| 58 | if (!idev)
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| 59 | return -ENOMEM;
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| 60 |
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| 61 | idev->name = pdev->name;
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| 62 | snprintf(pwr->phys, sizeof(pwr->phys), "%s/input0",
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| 63 | pdev->name);
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| 64 | idev->phys = pwr->phys;
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| 65 | idev->id.bustype = BUS_I2C;
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| 66 |
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| 67 | input_set_capability(idev, EV_KEY, KEY_POWER);
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| 68 |
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| 69 | pwr->dev = dev;
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| 70 | pwr->idev = idev;
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| 71 | device_init_wakeup(dev, true);
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| 72 |
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| 73 | push_irq = platform_get_irq(pdev, 0);
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| 74 | if (push_irq < 0)
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| 75 | return -EINVAL;
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| 76 |
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| 77 | release_irq = platform_get_irq(pdev, 1);
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| 78 | if (release_irq < 0)
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| 79 | return -EINVAL;
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| 80 |
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| 81 | error = devm_request_threaded_irq(dev, push_irq, NULL,
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| 82 | tps6594_pb_push_irq,
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| 83 | IRQF_ONESHOT,
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| 84 | pdev->resource[0].name, pwr);
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| 85 | if (error) {
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| 86 | dev_err(dev, "failed to request push IRQ #%d: %d\n", push_irq,
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| 87 | error);
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| 88 | return error;
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| 89 | }
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| 90 |
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| 91 | error = devm_request_threaded_irq(dev, release_irq, NULL,
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| 92 | tps6594_pb_release_irq,
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| 93 | IRQF_ONESHOT,
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| 94 | pdev->resource[1].name, pwr);
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| 95 | if (error) {
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| 96 | dev_err(dev, "failed to request release IRQ #%d: %d\n",
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| 97 | release_irq, error);
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| 98 | return error;
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| 99 | }
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| 100 |
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| 101 | error = input_register_device(idev);
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| 102 | if (error) {
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| 103 | dev_err(dev, "Can't register power button: %d\n", error);
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| 104 | return error;
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| 105 | }
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| 106 |
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| 107 | return 0;
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| 108 | }
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| 109 |
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| 110 | static const struct platform_device_id tps6594_pwrbtn_id_table[] = {
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| 111 | { "tps6594-pwrbutton", },
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| 112 | { }
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| 113 | };
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| 114 | MODULE_DEVICE_TABLE(platform, tps6594_pwrbtn_id_table);
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| 115 |
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| 116 | static struct platform_driver tps6594_pb_driver = {
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| 117 | .probe = tps6594_pb_probe,
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| 118 | .driver = {
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| 119 | .name = "tps6594_pwrbutton",
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| 120 | },
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| 121 | .id_table = tps6594_pwrbtn_id_table,
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| 122 | };
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| 123 | module_platform_driver(tps6594_pb_driver);
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| 124 |
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| 125 | MODULE_DESCRIPTION("TPS6594 Power Button");
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| 126 | MODULE_LICENSE("GPL");
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