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Linux/drivers/input/misc/da9052_onkey.c

  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                 .owner  = THIS_MODULE,
153         },
154 };
155 module_platform_driver(da9052_onkey_driver);
156 
157 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
158 MODULE_DESCRIPTION("Onkey driver for DA9052");
159 MODULE_LICENSE("GPL");
160 MODULE_ALIAS("platform:da9052-onkey");
161 

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