1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Power-button driver for Dollar Cove TI PMIC 4 * Copyright (C) 2014 Intel Corp 5 * Copyright (c) 2017 Takashi Iwai <tiwai@suse.de> 6 */ 7 8 #include <linux/input.h> 9 #include <linux/interrupt.h> 10 #include <linux/device.h> 11 #include <linux/mfd/intel_soc_pmic.h> 12 #include <linux/module.h> 13 #include <linux/platform_device.h> 14 #include <linux/pm_wakeirq.h> 15 #include <linux/slab.h> 16 17 #define CHTDC_TI_SIRQ_REG 0x3 18 #define SIRQ_PWRBTN_REL BIT(0) 19 20 static irqreturn_t chtdc_ti_pwrbtn_interrupt(int irq, void *dev_id) 21 { 22 struct input_dev *input = dev_id; 23 struct device *dev = input->dev.parent; 24 struct regmap *regmap = dev_get_drvdata(dev); 25 int state; 26 27 if (!regmap_read(regmap, CHTDC_TI_SIRQ_REG, &state)) { 28 dev_dbg(dev, "SIRQ_REG=0x%x\n", state); 29 input_report_key(input, KEY_POWER, !(state & SIRQ_PWRBTN_REL)); 30 input_sync(input); 31 } 32 33 return IRQ_HANDLED; 34 } 35 36 static int chtdc_ti_pwrbtn_probe(struct platform_device *pdev) 37 { 38 struct device *dev = &pdev->dev; 39 struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent); 40 struct input_dev *input; 41 int irq, err; 42 43 irq = platform_get_irq(pdev, 0); 44 if (irq < 0) 45 return irq; 46 input = devm_input_allocate_device(dev); 47 if (!input) 48 return -ENOMEM; 49 input->name = pdev->name; 50 input->phys = "power-button/input0"; 51 input->id.bustype = BUS_HOST; 52 input_set_capability(input, EV_KEY, KEY_POWER); 53 err = input_register_device(input); 54 if (err) 55 return err; 56 57 dev_set_drvdata(dev, pmic->regmap); 58 59 err = devm_request_threaded_irq(dev, irq, NULL, 60 chtdc_ti_pwrbtn_interrupt, 61 IRQF_ONESHOT, KBUILD_MODNAME, input); 62 if (err) 63 return err; 64 65 device_init_wakeup(dev, true); 66 dev_pm_set_wake_irq(dev, irq); 67 return 0; 68 } 69 70 static int chtdc_ti_pwrbtn_remove(struct platform_device *pdev) 71 { 72 dev_pm_clear_wake_irq(&pdev->dev); 73 device_init_wakeup(&pdev->dev, false); 74 return 0; 75 } 76 77 static const struct platform_device_id chtdc_ti_pwrbtn_id_table[] = { 78 { .name = "chtdc_ti_pwrbtn" }, 79 {}, 80 }; 81 MODULE_DEVICE_TABLE(platform, chtdc_ti_pwrbtn_id_table); 82 83 static struct platform_driver chtdc_ti_pwrbtn_driver = { 84 .driver = { 85 .name = KBUILD_MODNAME, 86 }, 87 .probe = chtdc_ti_pwrbtn_probe, 88 .remove = chtdc_ti_pwrbtn_remove, 89 .id_table = chtdc_ti_pwrbtn_id_table, 90 }; 91 module_platform_driver(chtdc_ti_pwrbtn_driver); 92 93 MODULE_DESCRIPTION("Power-button driver for Dollar Cove TI PMIC"); 94 MODULE_LICENSE("GPL v2"); 95