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78a56aab PB |
1 | /* |
2 | * Driver for keys on GPIO lines capable of generating interrupts. | |
3 | * | |
4 | * Copyright 2005 Phil Blundell | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/version.h> | |
13 | ||
14 | #include <linux/init.h> | |
15 | #include <linux/fs.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/irq.h> | |
18 | #include <linux/sched.h> | |
19 | #include <linux/pm.h> | |
20 | #include <linux/sysctl.h> | |
21 | #include <linux/proc_fs.h> | |
22 | #include <linux/delay.h> | |
23 | #include <linux/platform_device.h> | |
24 | #include <linux/input.h> | |
25 | #include <linux/irq.h> | |
26 | ||
0d98f6bb | 27 | #include <asm/gpio.h> |
78a56aab PB |
28 | #include <asm/arch/hardware.h> |
29 | ||
30 | #include <asm/hardware/gpio_keys.h> | |
31 | ||
32 | static irqreturn_t gpio_keys_isr(int irq, void *dev_id) | |
33 | { | |
34 | int i; | |
35 | struct platform_device *pdev = dev_id; | |
36 | struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; | |
37 | struct input_dev *input = platform_get_drvdata(pdev); | |
38 | ||
39 | for (i = 0; i < pdata->nbuttons; i++) { | |
40 | int gpio = pdata->buttons[i].gpio; | |
0d98f6bb PZ |
41 | if (irq == gpio_to_irq(gpio)) { |
42 | int state = (gpio_get_value(gpio) ? 1 : 0) ^ (pdata->buttons[i].active_low); | |
78a56aab PB |
43 | |
44 | input_report_key(input, pdata->buttons[i].keycode, state); | |
45 | input_sync(input); | |
46 | } | |
47 | } | |
48 | ||
49 | return IRQ_HANDLED; | |
50 | } | |
51 | ||
52 | static int __devinit gpio_keys_probe(struct platform_device *pdev) | |
53 | { | |
54 | struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; | |
55 | struct input_dev *input; | |
56 | int i, error; | |
57 | ||
58 | input = input_allocate_device(); | |
59 | if (!input) | |
60 | return -ENOMEM; | |
61 | ||
62 | platform_set_drvdata(pdev, input); | |
63 | ||
64 | input->evbit[0] = BIT(EV_KEY); | |
65 | ||
66 | input->name = pdev->name; | |
67 | input->phys = "gpio-keys/input0"; | |
68 | input->cdev.dev = &pdev->dev; | |
78a56aab PB |
69 | |
70 | input->id.bustype = BUS_HOST; | |
71 | input->id.vendor = 0x0001; | |
72 | input->id.product = 0x0001; | |
73 | input->id.version = 0x0100; | |
74 | ||
75 | for (i = 0; i < pdata->nbuttons; i++) { | |
76 | int code = pdata->buttons[i].keycode; | |
0d98f6bb | 77 | int irq = gpio_to_irq(pdata->buttons[i].gpio); |
78a56aab PB |
78 | |
79 | set_irq_type(irq, IRQ_TYPE_EDGE_BOTH); | |
2db6346f | 80 | error = request_irq(irq, gpio_keys_isr, IRQF_SAMPLE_RANDOM, |
78a56aab PB |
81 | pdata->buttons[i].desc ? pdata->buttons[i].desc : "gpio_keys", |
82 | pdev); | |
83 | if (error) { | |
0d98f6bb PZ |
84 | printk(KERN_ERR "gpio-keys: unable to claim irq %d; error %d\n", |
85 | irq, error); | |
78a56aab PB |
86 | goto fail; |
87 | } | |
88 | set_bit(code, input->keybit); | |
89 | } | |
90 | ||
91 | error = input_register_device(input); | |
92 | if (error) { | |
93 | printk(KERN_ERR "Unable to register gpio-keys input device\n"); | |
94 | goto fail; | |
95 | } | |
96 | ||
97 | return 0; | |
98 | ||
99 | fail: | |
100 | for (i = i - 1; i >= 0; i--) | |
0d98f6bb | 101 | free_irq(gpio_to_irq(pdata->buttons[i].gpio), pdev); |
78a56aab PB |
102 | |
103 | input_free_device(input); | |
104 | ||
105 | return error; | |
106 | } | |
107 | ||
108 | static int __devexit gpio_keys_remove(struct platform_device *pdev) | |
109 | { | |
110 | struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; | |
111 | struct input_dev *input = platform_get_drvdata(pdev); | |
112 | int i; | |
113 | ||
114 | for (i = 0; i < pdata->nbuttons; i++) { | |
0d98f6bb | 115 | int irq = gpio_to_irq(pdata->buttons[i].gpio); |
78a56aab PB |
116 | free_irq(irq, pdev); |
117 | } | |
118 | ||
119 | input_unregister_device(input); | |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
124 | struct platform_driver gpio_keys_device_driver = { | |
125 | .probe = gpio_keys_probe, | |
126 | .remove = __devexit_p(gpio_keys_remove), | |
127 | .driver = { | |
128 | .name = "gpio-keys", | |
129 | } | |
130 | }; | |
131 | ||
132 | static int __init gpio_keys_init(void) | |
133 | { | |
134 | return platform_driver_register(&gpio_keys_device_driver); | |
135 | } | |
136 | ||
137 | static void __exit gpio_keys_exit(void) | |
138 | { | |
139 | platform_driver_unregister(&gpio_keys_device_driver); | |
140 | } | |
141 | ||
142 | module_init(gpio_keys_init); | |
143 | module_exit(gpio_keys_exit); | |
144 | ||
145 | MODULE_LICENSE("GPL"); | |
146 | MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>"); | |
147 | MODULE_DESCRIPTION("Keyboard driver for CPU GPIOs"); |