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| 2 | |
| 3 | * Copyright (C) 2022 Richtek Technology Corp.
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| 4 | * Author: ChiYuan Huang <[email protected]>
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| 5 |
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| 6 |
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| 7 | #include <linux/bits.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/module.h>
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| 12 | #include <linux/platform_device.h>
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| 13 | #include <linux/regmap.h>
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| 14 |
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| 15 | #define RT5120_REG_INTSTAT 0x1E
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| 16 | #define RT5120_PWRKEYSTAT_MASK BIT(7)
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| 17 |
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| 18 | struct rt5120_priv {
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| 19 | struct regmap *regmap;
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| 20 | struct input_dev *input;
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| 21 | };
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| 22 |
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| 23 | static irqreturn_t rt5120_pwrkey_handler(int irq, void *devid)
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| 24 | {
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| 25 | struct rt5120_priv *priv = devid;
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| 26 | unsigned int stat;
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| 27 | int error;
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| 28 |
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| 29 | error = regmap_read(priv->regmap, RT5120_REG_INTSTAT, &stat);
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| 30 | if (error)
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| 31 | return IRQ_NONE;
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| 32 |
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| 33 | input_report_key(priv->input, KEY_POWER,
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| 34 | !(stat & RT5120_PWRKEYSTAT_MASK));
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| 35 | input_sync(priv->input);
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| 36 |
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| 37 | return IRQ_HANDLED;
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| 38 | }
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| 39 |
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| 40 | static int rt5120_pwrkey_probe(struct platform_device *pdev)
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| 41 | {
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| 42 | struct rt5120_priv *priv;
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| 43 | struct device *dev = &pdev->dev;
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| 44 | int press_irq, release_irq;
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| 45 | int error;
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| 46 |
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| 47 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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| 48 | if (!priv)
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| 49 | return -ENOMEM;
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| 50 |
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| 51 | priv->regmap = dev_get_regmap(dev->parent, NULL);
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| 52 | if (!priv->regmap) {
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| 53 | dev_err(dev, "Failed to init regmap\n");
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| 54 | return -ENODEV;
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| 55 | }
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| 56 |
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| 57 | press_irq = platform_get_irq_byname(pdev, "pwrkey-press");
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| 58 | if (press_irq < 0)
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| 59 | return press_irq;
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| 60 |
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| 61 | release_irq = platform_get_irq_byname(pdev, "pwrkey-release");
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| 62 | if (release_irq < 0)
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| 63 | return release_irq;
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| 64 |
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| 65 |
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| 66 | priv->input = devm_input_allocate_device(dev);
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| 67 | if (!priv->input)
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| 68 | return -ENOMEM;
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| 69 |
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| 70 | priv->input->name = "rt5120_pwrkey";
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| 71 | priv->input->phys = "rt5120_pwrkey/input0";
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| 72 | priv->input->id.bustype = BUS_I2C;
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| 73 | input_set_capability(priv->input, EV_KEY, KEY_POWER);
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| 74 |
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| 75 | error = input_register_device(priv->input);
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| 76 | if (error) {
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| 77 | dev_err(dev, "Failed to register input device: %d\n", error);
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| 78 | return error;
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| 79 | }
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| 80 |
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| 81 | error = devm_request_threaded_irq(dev, press_irq,
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| 82 | NULL, rt5120_pwrkey_handler,
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| 83 | 0, "pwrkey-press", priv);
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| 84 | if (error) {
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| 85 | dev_err(dev,
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| 86 | "Failed to register pwrkey press irq: %d\n", error);
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| 87 | return error;
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| 88 | }
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| 89 |
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| 90 | error = devm_request_threaded_irq(dev, release_irq,
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| 91 | NULL, rt5120_pwrkey_handler,
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| 92 | 0, "pwrkey-release", priv);
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| 93 | if (error) {
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| 94 | dev_err(dev,
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| 95 | "Failed to register pwrkey release irq: %d\n", error);
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| 96 | return error;
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| 97 | }
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| 98 |
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| 99 | return 0;
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| 100 | }
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| 101 |
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| 102 | static const struct of_device_id r5120_pwrkey_match_table[] = {
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| 103 | { .compatible = "richtek,rt5120-pwrkey" },
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| 104 | {}
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| 105 | };
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| 106 | MODULE_DEVICE_TABLE(of, r5120_pwrkey_match_table);
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| 107 |
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| 108 | static struct platform_driver rt5120_pwrkey_driver = {
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| 109 | .driver = {
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| 110 | .name = "rt5120-pwrkey",
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| 111 | .of_match_table = r5120_pwrkey_match_table,
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| 112 | },
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| 113 | .probe = rt5120_pwrkey_probe,
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| 114 | };
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| 115 | module_platform_driver(rt5120_pwrkey_driver);
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| 116 |
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| 117 | MODULE_AUTHOR("ChiYuan Huang <[email protected]>");
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| 118 | MODULE_DESCRIPTION("Richtek RT5120 power key driver");
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| 119 | MODULE_LICENSE("GPL");
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