1 /* 2 * ON pin driver for Dialog DA9052 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 #include <linux/workqueue.h> 18 19 #include <linux/mfd/da9052/da9052.h> 20 #include <linux/mfd/da9052/reg.h> 21 22 struct da9052_onkey { 23 struct da9052 *da9052; 24 struct input_dev *input; 25 struct delayed_work work; 26 }; 27 28 static void da9052_onkey_query(struct da9052_onkey *onkey) 29 { 30 int ret; 31 32 ret = da9052_reg_read(onkey->da9052, DA9052_STATUS_A_REG); 33 if (ret < 0) { 34 dev_err(onkey->da9052->dev, 35 "Failed to read onkey event err=%d\n", ret); 36 } else { 37 /* 38 * Since interrupt for deassertion of ONKEY pin is not 39 * generated, onkey event state determines the onkey 40 * button state. 41 */ 42 bool pressed = !(ret & DA9052_STATUSA_NONKEY); 43 44 input_report_key(onkey->input, KEY_POWER, pressed); 45 input_sync(onkey->input); 46 47 /* 48 * Interrupt is generated only when the ONKEY pin 49 * is asserted. Hence the deassertion of the pin 50 * is simulated through work queue. 51 */ 52 if (pressed) 53 schedule_delayed_work(&onkey->work, 54 msecs_to_jiffies(50)); 55 } 56 } 57 58 static void da9052_onkey_work(struct work_struct *work) 59 { 60 struct da9052_onkey *onkey = container_of(work, struct da9052_onkey, 61 work.work); 62 63 da9052_onkey_query(onkey); 64 } 65 66 static irqreturn_t da9052_onkey_irq(int irq, void *data) 67 { 68 struct da9052_onkey *onkey = data; 69 70 da9052_onkey_query(onkey); 71 72 return IRQ_HANDLED; 73 } 74 75 static int da9052_onkey_probe(struct platform_device *pdev) 76 { 77 struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent); 78 struct da9052_onkey *onkey; 79 struct input_dev *input_dev; 80 int error; 81 82 if (!da9052) { 83 dev_err(&pdev->dev, "Failed to get the driver's data\n"); 84 return -EINVAL; 85 } 86 87 onkey = kzalloc(sizeof(*onkey), GFP_KERNEL); 88 input_dev = input_allocate_device(); 89 if (!onkey || !input_dev) { 90 dev_err(&pdev->dev, "Failed to allocate memory\n"); 91 error = -ENOMEM; 92 goto err_free_mem; 93 } 94 95 onkey->input = input_dev; 96 onkey->da9052 = da9052; 97 INIT_DELAYED_WORK(&onkey->work, da9052_onkey_work); 98 99 input_dev->name = "da9052-onkey"; 100 input_dev->phys = "da9052-onkey/input0"; 101 input_dev->dev.parent = &pdev->dev; 102 103 input_dev->evbit[0] = BIT_MASK(EV_KEY); 104 __set_bit(KEY_POWER, input_dev->keybit); 105 106 error = da9052_request_irq(onkey->da9052, DA9052_IRQ_NONKEY, "ONKEY", 107 da9052_onkey_irq, onkey); 108 if (error < 0) { 109 dev_err(onkey->da9052->dev, 110 "Failed to register ONKEY IRQ: %d\n", error); 111 goto err_free_mem; 112 } 113 114 error = input_register_device(onkey->input); 115 if (error) { 116 dev_err(&pdev->dev, "Unable to register input device, %d\n", 117 error); 118 goto err_free_irq; 119 } 120 121 platform_set_drvdata(pdev, onkey); 122 return 0; 123 124 err_free_irq: 125 da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey); 126 cancel_delayed_work_sync(&onkey->work); 127 err_free_mem: 128 input_free_device(input_dev); 129 kfree(onkey); 130 131 return error; 132 } 133 134 static int da9052_onkey_remove(struct platform_device *pdev) 135 { 136 struct da9052_onkey *onkey = platform_get_drvdata(pdev); 137 138 da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey); 139 cancel_delayed_work_sync(&onkey->work); 140 141 input_unregister_device(onkey->input); 142 kfree(onkey); 143 144 return 0; 145 } 146 147 static struct platform_driver da9052_onkey_driver = { 148 .probe = da9052_onkey_probe, 149 .remove = da9052_onkey_remove, 150 .driver = { 151 .name = "da9052-onkey", 152 }, 153 }; 154 module_platform_driver(da9052_onkey_driver); 155 156 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 157 MODULE_DESCRIPTION("Onkey driver for DA9052"); 158 MODULE_LICENSE("GPL"); 159 MODULE_ALIAS("platform:da9052-onkey"); 160