1*170031ffSJob Sava // SPDX-License-Identifier: GPL-2.0 2*170031ffSJob Sava /* 3*170031ffSJob Sava * power button driver for TI TPS6594 PMICs 4*170031ffSJob Sava * 5*170031ffSJob Sava * Copyright (C) 2025 Critical Link LLC - https://www.criticallink.com/ 6*170031ffSJob Sava */ 7*170031ffSJob Sava #include <linux/init.h> 8*170031ffSJob Sava #include <linux/input.h> 9*170031ffSJob Sava #include <linux/interrupt.h> 10*170031ffSJob Sava #include <linux/kernel.h> 11*170031ffSJob Sava #include <linux/mfd/tps6594.h> 12*170031ffSJob Sava #include <linux/module.h> 13*170031ffSJob Sava #include <linux/platform_device.h> 14*170031ffSJob Sava #include <linux/regmap.h> 15*170031ffSJob Sava #include <linux/slab.h> 16*170031ffSJob Sava 17*170031ffSJob Sava struct tps6594_pwrbutton { 18*170031ffSJob Sava struct device *dev; 19*170031ffSJob Sava struct input_dev *idev; 20*170031ffSJob Sava char phys[32]; 21*170031ffSJob Sava }; 22*170031ffSJob Sava 23*170031ffSJob Sava static irqreturn_t tps6594_pb_push_irq(int irq, void *_pwr) 24*170031ffSJob Sava { 25*170031ffSJob Sava struct tps6594_pwrbutton *pwr = _pwr; 26*170031ffSJob Sava 27*170031ffSJob Sava input_report_key(pwr->idev, KEY_POWER, 1); 28*170031ffSJob Sava pm_wakeup_event(pwr->dev, 0); 29*170031ffSJob Sava input_sync(pwr->idev); 30*170031ffSJob Sava 31*170031ffSJob Sava return IRQ_HANDLED; 32*170031ffSJob Sava } 33*170031ffSJob Sava 34*170031ffSJob Sava static irqreturn_t tps6594_pb_release_irq(int irq, void *_pwr) 35*170031ffSJob Sava { 36*170031ffSJob Sava struct tps6594_pwrbutton *pwr = _pwr; 37*170031ffSJob Sava 38*170031ffSJob Sava input_report_key(pwr->idev, KEY_POWER, 0); 39*170031ffSJob Sava input_sync(pwr->idev); 40*170031ffSJob Sava 41*170031ffSJob Sava return IRQ_HANDLED; 42*170031ffSJob Sava } 43*170031ffSJob Sava 44*170031ffSJob Sava static int tps6594_pb_probe(struct platform_device *pdev) 45*170031ffSJob Sava { 46*170031ffSJob Sava struct device *dev = &pdev->dev; 47*170031ffSJob Sava struct tps6594_pwrbutton *pwr; 48*170031ffSJob Sava struct input_dev *idev; 49*170031ffSJob Sava int error; 50*170031ffSJob Sava int push_irq; 51*170031ffSJob Sava int release_irq; 52*170031ffSJob Sava 53*170031ffSJob Sava pwr = devm_kzalloc(dev, sizeof(*pwr), GFP_KERNEL); 54*170031ffSJob Sava if (!pwr) 55*170031ffSJob Sava return -ENOMEM; 56*170031ffSJob Sava 57*170031ffSJob Sava idev = devm_input_allocate_device(dev); 58*170031ffSJob Sava if (!idev) 59*170031ffSJob Sava return -ENOMEM; 60*170031ffSJob Sava 61*170031ffSJob Sava idev->name = pdev->name; 62*170031ffSJob Sava snprintf(pwr->phys, sizeof(pwr->phys), "%s/input0", 63*170031ffSJob Sava pdev->name); 64*170031ffSJob Sava idev->phys = pwr->phys; 65*170031ffSJob Sava idev->id.bustype = BUS_I2C; 66*170031ffSJob Sava 67*170031ffSJob Sava input_set_capability(idev, EV_KEY, KEY_POWER); 68*170031ffSJob Sava 69*170031ffSJob Sava pwr->dev = dev; 70*170031ffSJob Sava pwr->idev = idev; 71*170031ffSJob Sava device_init_wakeup(dev, true); 72*170031ffSJob Sava 73*170031ffSJob Sava push_irq = platform_get_irq(pdev, 0); 74*170031ffSJob Sava if (push_irq < 0) 75*170031ffSJob Sava return -EINVAL; 76*170031ffSJob Sava 77*170031ffSJob Sava release_irq = platform_get_irq(pdev, 1); 78*170031ffSJob Sava if (release_irq < 0) 79*170031ffSJob Sava return -EINVAL; 80*170031ffSJob Sava 81*170031ffSJob Sava error = devm_request_threaded_irq(dev, push_irq, NULL, 82*170031ffSJob Sava tps6594_pb_push_irq, 83*170031ffSJob Sava IRQF_ONESHOT, 84*170031ffSJob Sava pdev->resource[0].name, pwr); 85*170031ffSJob Sava if (error) { 86*170031ffSJob Sava dev_err(dev, "failed to request push IRQ #%d: %d\n", push_irq, 87*170031ffSJob Sava error); 88*170031ffSJob Sava return error; 89*170031ffSJob Sava } 90*170031ffSJob Sava 91*170031ffSJob Sava error = devm_request_threaded_irq(dev, release_irq, NULL, 92*170031ffSJob Sava tps6594_pb_release_irq, 93*170031ffSJob Sava IRQF_ONESHOT, 94*170031ffSJob Sava pdev->resource[1].name, pwr); 95*170031ffSJob Sava if (error) { 96*170031ffSJob Sava dev_err(dev, "failed to request release IRQ #%d: %d\n", 97*170031ffSJob Sava release_irq, error); 98*170031ffSJob Sava return error; 99*170031ffSJob Sava } 100*170031ffSJob Sava 101*170031ffSJob Sava error = input_register_device(idev); 102*170031ffSJob Sava if (error) { 103*170031ffSJob Sava dev_err(dev, "Can't register power button: %d\n", error); 104*170031ffSJob Sava return error; 105*170031ffSJob Sava } 106*170031ffSJob Sava 107*170031ffSJob Sava return 0; 108*170031ffSJob Sava } 109*170031ffSJob Sava 110*170031ffSJob Sava static const struct platform_device_id tps6594_pwrbtn_id_table[] = { 111*170031ffSJob Sava { "tps6594-pwrbutton", }, 112*170031ffSJob Sava { /* sentinel */ } 113*170031ffSJob Sava }; 114*170031ffSJob Sava MODULE_DEVICE_TABLE(platform, tps6594_pwrbtn_id_table); 115*170031ffSJob Sava 116*170031ffSJob Sava static struct platform_driver tps6594_pb_driver = { 117*170031ffSJob Sava .probe = tps6594_pb_probe, 118*170031ffSJob Sava .driver = { 119*170031ffSJob Sava .name = "tps6594_pwrbutton", 120*170031ffSJob Sava }, 121*170031ffSJob Sava .id_table = tps6594_pwrbtn_id_table, 122*170031ffSJob Sava }; 123*170031ffSJob Sava module_platform_driver(tps6594_pb_driver); 124*170031ffSJob Sava 125*170031ffSJob Sava MODULE_DESCRIPTION("TPS6594 Power Button"); 126*170031ffSJob Sava MODULE_LICENSE("GPL"); 127