1 /* 2 * ON pin driver for Dialog DA9055 PMICs 3 * 4 * Copyright(c) 2012 Dialog Semiconductor Ltd. 5 * 6 * Author: David Dajun Chen <dchen@diasemi.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 */ 13 14 #include <linux/input.h> 15 #include <linux/module.h> 16 #include <linux/platform_device.h> 17 18 #include <linux/mfd/da9055/core.h> 19 #include <linux/mfd/da9055/reg.h> 20 21 struct da9055_onkey { 22 struct da9055 *da9055; 23 struct input_dev *input; 24 struct delayed_work work; 25 }; 26 27 static void da9055_onkey_query(struct da9055_onkey *onkey) 28 { 29 int key_stat; 30 31 key_stat = da9055_reg_read(onkey->da9055, DA9055_REG_STATUS_A); 32 if (key_stat < 0) { 33 dev_err(onkey->da9055->dev, 34 "Failed to read onkey event %d\n", key_stat); 35 } else { 36 key_stat &= DA9055_NOKEY_STS; 37 /* 38 * Onkey status bit is cleared when onkey button is released. 39 */ 40 if (!key_stat) { 41 input_report_key(onkey->input, KEY_POWER, 0); 42 input_sync(onkey->input); 43 } 44 } 45 46 /* 47 * Interrupt is generated only when the ONKEY pin is asserted. 48 * Hence the deassertion of the pin is simulated through work queue. 49 */ 50 if (key_stat) 51 schedule_delayed_work(&onkey->work, msecs_to_jiffies(10)); 52 53 } 54 55 static void da9055_onkey_work(struct work_struct *work) 56 { 57 struct da9055_onkey *onkey = container_of(work, struct da9055_onkey, 58 work.work); 59 60 da9055_onkey_query(onkey); 61 } 62 63 static irqreturn_t da9055_onkey_irq(int irq, void *data) 64 { 65 struct da9055_onkey *onkey = data; 66 67 input_report_key(onkey->input, KEY_POWER, 1); 68 input_sync(onkey->input); 69 70 da9055_onkey_query(onkey); 71 72 return IRQ_HANDLED; 73 } 74 75 static int da9055_onkey_probe(struct platform_device *pdev) 76 { 77 struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent); 78 struct da9055_onkey *onkey; 79 struct input_dev *input_dev; 80 int irq, err; 81 82 irq = platform_get_irq_byname(pdev, "ONKEY"); 83 if (irq < 0) { 84 dev_err(&pdev->dev, 85 "Failed to get an IRQ for input device, %d\n", irq); 86 return -EINVAL; 87 } 88 89 onkey = devm_kzalloc(&pdev->dev, sizeof(*onkey), GFP_KERNEL); 90 if (!onkey) { 91 dev_err(&pdev->dev, "Failed to allocate memory\n"); 92 return -ENOMEM; 93 } 94 95 input_dev = input_allocate_device(); 96 if (!input_dev) { 97 dev_err(&pdev->dev, "Failed to allocate memory\n"); 98 return -ENOMEM; 99 } 100 101 onkey->input = input_dev; 102 onkey->da9055 = da9055; 103 input_dev->name = "da9055-onkey"; 104 input_dev->phys = "da9055-onkey/input0"; 105 input_dev->dev.parent = &pdev->dev; 106 107 input_dev->evbit[0] = BIT_MASK(EV_KEY); 108 __set_bit(KEY_POWER, input_dev->keybit); 109 110 INIT_DELAYED_WORK(&onkey->work, da9055_onkey_work); 111 112 err = request_threaded_irq(irq, NULL, da9055_onkey_irq, 113 IRQF_TRIGGER_HIGH | IRQF_ONESHOT, 114 "ONKEY", onkey); 115 if (err < 0) { 116 dev_err(&pdev->dev, 117 "Failed to register ONKEY IRQ %d, error = %d\n", 118 irq, err); 119 goto err_free_input; 120 } 121 122 err = input_register_device(input_dev); 123 if (err) { 124 dev_err(&pdev->dev, "Unable to register input device, %d\n", 125 err); 126 goto err_free_irq; 127 } 128 129 platform_set_drvdata(pdev, onkey); 130 131 return 0; 132 133 err_free_irq: 134 free_irq(irq, onkey); 135 cancel_delayed_work_sync(&onkey->work); 136 err_free_input: 137 input_free_device(input_dev); 138 139 return err; 140 } 141 142 static int da9055_onkey_remove(struct platform_device *pdev) 143 { 144 struct da9055_onkey *onkey = platform_get_drvdata(pdev); 145 int irq = platform_get_irq_byname(pdev, "ONKEY"); 146 147 irq = regmap_irq_get_virq(onkey->da9055->irq_data, irq); 148 free_irq(irq, onkey); 149 cancel_delayed_work_sync(&onkey->work); 150 input_unregister_device(onkey->input); 151 152 return 0; 153 } 154 155 static struct platform_driver da9055_onkey_driver = { 156 .probe = da9055_onkey_probe, 157 .remove = da9055_onkey_remove, 158 .driver = { 159 .name = "da9055-onkey", 160 }, 161 }; 162 163 module_platform_driver(da9055_onkey_driver); 164 165 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 166 MODULE_DESCRIPTION("Onkey driver for DA9055"); 167 MODULE_LICENSE("GPL"); 168 MODULE_ALIAS("platform:da9055-onkey"); 169