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/init.h> 15 #include <linux/input.h> 16 #include <linux/module.h> 17 #include <linux/platform_device.h> 18 19 #include <linux/mfd/da9055/core.h> 20 #include <linux/mfd/da9055/reg.h> 21 22 struct da9055_onkey { 23 struct da9055 *da9055; 24 struct input_dev *input; 25 struct delayed_work work; 26 }; 27 28 static void da9055_onkey_query(struct da9055_onkey *onkey) 29 { 30 int key_stat; 31 32 key_stat = da9055_reg_read(onkey->da9055, DA9055_REG_STATUS_A); 33 if (key_stat < 0) { 34 dev_err(onkey->da9055->dev, 35 "Failed to read onkey event %d\n", key_stat); 36 } else { 37 key_stat &= DA9055_NOKEY_STS; 38 /* 39 * Onkey status bit is cleared when onkey button is relased. 40 */ 41 if (!key_stat) { 42 input_report_key(onkey->input, KEY_POWER, 0); 43 input_sync(onkey->input); 44 } 45 } 46 47 /* 48 * Interrupt is generated only when the ONKEY pin is asserted. 49 * Hence the deassertion of the pin is simulated through work queue. 50 */ 51 if (key_stat) 52 schedule_delayed_work(&onkey->work, msecs_to_jiffies(10)); 53 54 } 55 56 static void da9055_onkey_work(struct work_struct *work) 57 { 58 struct da9055_onkey *onkey = container_of(work, struct da9055_onkey, 59 work.work); 60 61 da9055_onkey_query(onkey); 62 } 63 64 static irqreturn_t da9055_onkey_irq(int irq, void *data) 65 { 66 struct da9055_onkey *onkey = data; 67 68 input_report_key(onkey->input, KEY_POWER, 1); 69 input_sync(onkey->input); 70 71 da9055_onkey_query(onkey); 72 73 return IRQ_HANDLED; 74 } 75 76 static int da9055_onkey_probe(struct platform_device *pdev) 77 { 78 struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent); 79 struct da9055_onkey *onkey; 80 struct input_dev *input_dev; 81 int irq, err; 82 83 irq = platform_get_irq_byname(pdev, "ONKEY"); 84 if (irq < 0) { 85 dev_err(&pdev->dev, 86 "Failed to get an IRQ for input device, %d\n", irq); 87 return -EINVAL; 88 } 89 90 onkey = devm_kzalloc(&pdev->dev, sizeof(*onkey), GFP_KERNEL); 91 if (!onkey) { 92 dev_err(&pdev->dev, "Failed to allocate memory\n"); 93 return -ENOMEM; 94 } 95 96 input_dev = input_allocate_device(); 97 if (!input_dev) { 98 dev_err(&pdev->dev, "Failed to allocate memory\n"); 99 return -ENOMEM; 100 } 101 102 onkey->input = input_dev; 103 onkey->da9055 = da9055; 104 input_dev->name = "da9055-onkey"; 105 input_dev->phys = "da9055-onkey/input0"; 106 input_dev->dev.parent = &pdev->dev; 107 108 input_dev->evbit[0] = BIT_MASK(EV_KEY); 109 __set_bit(KEY_POWER, input_dev->keybit); 110 111 INIT_DELAYED_WORK(&onkey->work, da9055_onkey_work); 112 113 irq = regmap_irq_get_virq(da9055->irq_data, irq); 114 err = request_threaded_irq(irq, NULL, da9055_onkey_irq, 115 IRQF_TRIGGER_HIGH | IRQF_ONESHOT, 116 "ONKEY", onkey); 117 if (err < 0) { 118 dev_err(&pdev->dev, 119 "Failed to register ONKEY IRQ %d, error = %d\n", 120 irq, err); 121 goto err_free_input; 122 } 123 124 err = input_register_device(input_dev); 125 if (err) { 126 dev_err(&pdev->dev, "Unable to register input device, %d\n", 127 err); 128 goto err_free_irq; 129 } 130 131 platform_set_drvdata(pdev, onkey); 132 133 return 0; 134 135 err_free_irq: 136 free_irq(irq, onkey); 137 cancel_delayed_work_sync(&onkey->work); 138 err_free_input: 139 input_free_device(input_dev); 140 141 return err; 142 } 143 144 static int da9055_onkey_remove(struct platform_device *pdev) 145 { 146 struct da9055_onkey *onkey = platform_get_drvdata(pdev); 147 int irq = platform_get_irq_byname(pdev, "ONKEY"); 148 149 irq = regmap_irq_get_virq(onkey->da9055->irq_data, irq); 150 free_irq(irq, onkey); 151 cancel_delayed_work_sync(&onkey->work); 152 input_unregister_device(onkey->input); 153 154 return 0; 155 } 156 157 static struct platform_driver da9055_onkey_driver = { 158 .probe = da9055_onkey_probe, 159 .remove = da9055_onkey_remove, 160 .driver = { 161 .name = "da9055-onkey", 162 .owner = THIS_MODULE, 163 }, 164 }; 165 166 module_platform_driver(da9055_onkey_driver); 167 168 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 169 MODULE_DESCRIPTION("Onkey driver for DA9055"); 170 MODULE_LICENSE("GPL"); 171 MODULE_ALIAS("platform:da9055-onkey"); 172