Ashish Jangam | 8ed2757 | 2012-10-30 00:27:25 -0700 | [diff] [blame] | 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 __devinit 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 __devexit 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 = __devexit_p(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"); |