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Linux/drivers/input/misc/da9055_onkey.c

  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                 .owner  = THIS_MODULE,
161         },
162 };
163 
164 module_platform_driver(da9055_onkey_driver);
165 
166 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
167 MODULE_DESCRIPTION("Onkey driver for DA9055");
168 MODULE_LICENSE("GPL");
169 MODULE_ALIAS("platform:da9055-onkey");
170 

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