1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Power-button driver for Basin Cove PMIC 4 * 5 * Copyright (c) 2019, Intel Corporation. 6 * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com> 7 */ 8 9 #include <linux/input.h> 10 #include <linux/interrupt.h> 11 #include <linux/device.h> 12 #include <linux/mfd/intel_soc_pmic.h> 13 #include <linux/mfd/intel_soc_pmic_mrfld.h> 14 #include <linux/module.h> 15 #include <linux/platform_device.h> 16 #include <linux/pm_wakeirq.h> 17 #include <linux/slab.h> 18 19 #define BCOVE_PBSTATUS 0x27 20 #define BCOVE_PBSTATUS_PBLVL BIT(4) /* 1 - release, 0 - press */ 21 22 static irqreturn_t mrfld_pwrbtn_interrupt(int irq, void *dev_id) 23 { 24 struct input_dev *input = dev_id; 25 struct device *dev = input->dev.parent; 26 struct regmap *regmap = dev_get_drvdata(dev); 27 unsigned int state; 28 int ret; 29 30 ret = regmap_read(regmap, BCOVE_PBSTATUS, &state); 31 if (ret) 32 return IRQ_NONE; 33 34 dev_dbg(dev, "PBSTATUS=0x%x\n", state); 35 input_report_key(input, KEY_POWER, !(state & BCOVE_PBSTATUS_PBLVL)); 36 input_sync(input); 37 38 regmap_update_bits(regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_PWRBTN, 0); 39 return IRQ_HANDLED; 40 } 41 42 static int mrfld_pwrbtn_probe(struct platform_device *pdev) 43 { 44 struct device *dev = &pdev->dev; 45 struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent); 46 struct input_dev *input; 47 int irq, ret; 48 49 irq = platform_get_irq(pdev, 0); 50 if (irq < 0) 51 return irq; 52 53 input = devm_input_allocate_device(dev); 54 if (!input) 55 return -ENOMEM; 56 input->name = pdev->name; 57 input->phys = "power-button/input0"; 58 input->id.bustype = BUS_HOST; 59 input->dev.parent = dev; 60 input_set_capability(input, EV_KEY, KEY_POWER); 61 ret = input_register_device(input); 62 if (ret) 63 return ret; 64 65 dev_set_drvdata(dev, pmic->regmap); 66 67 ret = devm_request_threaded_irq(dev, irq, NULL, mrfld_pwrbtn_interrupt, 68 IRQF_ONESHOT | IRQF_SHARED, pdev->name, 69 input); 70 if (ret) 71 return ret; 72 73 regmap_update_bits(pmic->regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_PWRBTN, 0); 74 regmap_update_bits(pmic->regmap, BCOVE_MPBIRQ, BCOVE_PBIRQ_PBTN, 0); 75 76 device_init_wakeup(dev, true); 77 dev_pm_set_wake_irq(dev, irq); 78 return 0; 79 } 80 81 static int mrfld_pwrbtn_remove(struct platform_device *pdev) 82 { 83 struct device *dev = &pdev->dev; 84 85 dev_pm_clear_wake_irq(dev); 86 device_init_wakeup(dev, false); 87 return 0; 88 } 89 90 static const struct platform_device_id mrfld_pwrbtn_id_table[] = { 91 { .name = "mrfld_bcove_pwrbtn" }, 92 {} 93 }; 94 MODULE_DEVICE_TABLE(platform, mrfld_pwrbtn_id_table); 95 96 static struct platform_driver mrfld_pwrbtn_driver = { 97 .driver = { 98 .name = "mrfld_bcove_pwrbtn", 99 }, 100 .probe = mrfld_pwrbtn_probe, 101 .remove = mrfld_pwrbtn_remove, 102 .id_table = mrfld_pwrbtn_id_table, 103 }; 104 module_platform_driver(mrfld_pwrbtn_driver); 105 106 MODULE_DESCRIPTION("Power-button driver for Basin Cove PMIC"); 107 MODULE_LICENSE("GPL v2"); 108