1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Marvell 88PM80x ONKEY driver 4 * 5 * Copyright (C) 2012 Marvell International Ltd. 6 * Haojian Zhuang <haojian.zhuang@marvell.com> 7 * Qiao Zhou <zhouqiao@marvell.com> 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/input.h> 13 #include <linux/mfd/88pm80x.h> 14 #include <linux/regmap.h> 15 #include <linux/slab.h> 16 17 #define PM800_LONG_ONKEY_EN (1 << 0) 18 #define PM800_LONG_KEY_DELAY (8) /* 1 .. 16 seconds */ 19 #define PM800_LONKEY_PRESS_TIME ((PM800_LONG_KEY_DELAY-1) << 4) 20 #define PM800_LONKEY_PRESS_TIME_MASK (0xF0) 21 #define PM800_SW_PDOWN (1 << 5) 22 23 struct pm80x_onkey_info { 24 struct input_dev *idev; 25 struct pm80x_chip *pm80x; 26 struct regmap *map; 27 int irq; 28 }; 29 30 /* 88PM80x gives us an interrupt when ONKEY is held */ 31 static irqreturn_t pm80x_onkey_handler(int irq, void *data) 32 { 33 struct pm80x_onkey_info *info = data; 34 int ret = 0; 35 unsigned int val; 36 37 ret = regmap_read(info->map, PM800_STATUS_1, &val); 38 if (ret < 0) { 39 dev_err(info->idev->dev.parent, "failed to read status: %d\n", ret); 40 return IRQ_NONE; 41 } 42 val &= PM800_ONKEY_STS1; 43 44 input_report_key(info->idev, KEY_POWER, val); 45 input_sync(info->idev); 46 47 return IRQ_HANDLED; 48 } 49 50 static SIMPLE_DEV_PM_OPS(pm80x_onkey_pm_ops, pm80x_dev_suspend, 51 pm80x_dev_resume); 52 53 static int pm80x_onkey_probe(struct platform_device *pdev) 54 { 55 56 struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent); 57 struct pm80x_onkey_info *info; 58 int err; 59 60 info = kzalloc(sizeof(*info), GFP_KERNEL); 61 if (!info) 62 return -ENOMEM; 63 64 info->pm80x = chip; 65 66 info->irq = platform_get_irq(pdev, 0); 67 if (info->irq < 0) { 68 err = -EINVAL; 69 goto out; 70 } 71 72 info->map = info->pm80x->regmap; 73 if (!info->map) { 74 dev_err(&pdev->dev, "no regmap!\n"); 75 err = -EINVAL; 76 goto out; 77 } 78 79 info->idev = input_allocate_device(); 80 if (!info->idev) { 81 dev_err(&pdev->dev, "Failed to allocate input dev\n"); 82 err = -ENOMEM; 83 goto out; 84 } 85 86 info->idev->name = "88pm80x_on"; 87 info->idev->phys = "88pm80x_on/input0"; 88 info->idev->id.bustype = BUS_I2C; 89 info->idev->dev.parent = &pdev->dev; 90 info->idev->evbit[0] = BIT_MASK(EV_KEY); 91 __set_bit(KEY_POWER, info->idev->keybit); 92 93 err = pm80x_request_irq(info->pm80x, info->irq, pm80x_onkey_handler, 94 IRQF_ONESHOT, "onkey", info); 95 if (err < 0) { 96 dev_err(&pdev->dev, "Failed to request IRQ: #%d: %d\n", 97 info->irq, err); 98 goto out_reg; 99 } 100 101 err = input_register_device(info->idev); 102 if (err) { 103 dev_err(&pdev->dev, "Can't register input device: %d\n", err); 104 goto out_irq; 105 } 106 107 platform_set_drvdata(pdev, info); 108 109 /* Enable long onkey detection */ 110 regmap_update_bits(info->map, PM800_RTC_MISC4, PM800_LONG_ONKEY_EN, 111 PM800_LONG_ONKEY_EN); 112 /* Set 8-second interval */ 113 regmap_update_bits(info->map, PM800_RTC_MISC3, 114 PM800_LONKEY_PRESS_TIME_MASK, 115 PM800_LONKEY_PRESS_TIME); 116 117 device_init_wakeup(&pdev->dev, 1); 118 return 0; 119 120 out_irq: 121 pm80x_free_irq(info->pm80x, info->irq, info); 122 out_reg: 123 input_free_device(info->idev); 124 out: 125 kfree(info); 126 return err; 127 } 128 129 static void pm80x_onkey_remove(struct platform_device *pdev) 130 { 131 struct pm80x_onkey_info *info = platform_get_drvdata(pdev); 132 133 pm80x_free_irq(info->pm80x, info->irq, info); 134 input_unregister_device(info->idev); 135 kfree(info); 136 } 137 138 static struct platform_driver pm80x_onkey_driver = { 139 .driver = { 140 .name = "88pm80x-onkey", 141 .pm = &pm80x_onkey_pm_ops, 142 }, 143 .probe = pm80x_onkey_probe, 144 .remove_new = pm80x_onkey_remove, 145 }; 146 147 module_platform_driver(pm80x_onkey_driver); 148 149 MODULE_LICENSE("GPL"); 150 MODULE_DESCRIPTION("Marvell 88PM80x ONKEY driver"); 151 MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>"); 152 MODULE_ALIAS("platform:88pm80x-onkey"); 153