projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 8ed2757e AJ |
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 | ||
| 8ed2757e AJ |
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 | /* | |
| 83a35e36 | 38 | * Onkey status bit is cleared when onkey button is released. |
| 8ed2757e AJ |
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 | ||
| 5298cc4c | 75 | static int da9055_onkey_probe(struct platform_device *pdev) |
| 8ed2757e AJ |
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 | ||
| 8ed2757e AJ |
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 | ||
| e2619cf7 | 142 | static int da9055_onkey_remove(struct platform_device *pdev) |
| 8ed2757e AJ |
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, | |
| 1cb0aa88 | 157 | .remove = da9055_onkey_remove, |
| 8ed2757e AJ |
158 | .driver = { |
| 159 | .name = "da9055-onkey", | |
| 8ed2757e AJ |
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"); |