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77686517 SI |
1 | /* |
2 | * Copyright (C) ST-Ericsson SA 2010 | |
3 | * | |
4 | * License Terms: GNU General Public License v2 | |
5 | * Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson | |
6 | * | |
7 | * AB8500 Power-On Key handler | |
8 | */ | |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/platform_device.h> | |
13 | #include <linux/input.h> | |
14 | #include <linux/interrupt.h> | |
ee66e653 | 15 | #include <linux/mfd/abx500/ab8500.h> |
77686517 SI |
16 | #include <linux/slab.h> |
17 | ||
18 | /** | |
19 | * struct ab8500_ponkey - ab8500 ponkey information | |
20 | * @input_dev: pointer to input device | |
21 | * @ab8500: ab8500 parent | |
22 | * @irq_dbf: irq number for falling transition | |
23 | * @irq_dbr: irq number for rising transition | |
24 | */ | |
25 | struct ab8500_ponkey { | |
26 | struct input_dev *idev; | |
27 | struct ab8500 *ab8500; | |
28 | int irq_dbf; | |
29 | int irq_dbr; | |
30 | }; | |
31 | ||
32 | /* AB8500 gives us an interrupt when ONKEY is held */ | |
33 | static irqreturn_t ab8500_ponkey_handler(int irq, void *data) | |
34 | { | |
35 | struct ab8500_ponkey *ponkey = data; | |
36 | ||
37 | if (irq == ponkey->irq_dbf) | |
38 | input_report_key(ponkey->idev, KEY_POWER, true); | |
39 | else if (irq == ponkey->irq_dbr) | |
40 | input_report_key(ponkey->idev, KEY_POWER, false); | |
41 | ||
42 | input_sync(ponkey->idev); | |
43 | ||
44 | return IRQ_HANDLED; | |
45 | } | |
46 | ||
47 | static int __devinit ab8500_ponkey_probe(struct platform_device *pdev) | |
48 | { | |
49 | struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent); | |
50 | struct ab8500_ponkey *ponkey; | |
51 | struct input_dev *input; | |
52 | int irq_dbf, irq_dbr; | |
53 | int error; | |
54 | ||
55 | irq_dbf = platform_get_irq_byname(pdev, "ONKEY_DBF"); | |
56 | if (irq_dbf < 0) { | |
57 | dev_err(&pdev->dev, "No IRQ for ONKEY_DBF, error=%d\n", irq_dbf); | |
58 | return irq_dbf; | |
59 | } | |
60 | ||
61 | irq_dbr = platform_get_irq_byname(pdev, "ONKEY_DBR"); | |
62 | if (irq_dbr < 0) { | |
63 | dev_err(&pdev->dev, "No IRQ for ONKEY_DBR, error=%d\n", irq_dbr); | |
64 | return irq_dbr; | |
65 | } | |
66 | ||
67 | ponkey = kzalloc(sizeof(struct ab8500_ponkey), GFP_KERNEL); | |
68 | input = input_allocate_device(); | |
69 | if (!ponkey || !input) { | |
70 | error = -ENOMEM; | |
71 | goto err_free_mem; | |
72 | } | |
73 | ||
74 | ponkey->idev = input; | |
75 | ponkey->ab8500 = ab8500; | |
76 | ponkey->irq_dbf = irq_dbf; | |
77 | ponkey->irq_dbr = irq_dbr; | |
78 | ||
79 | input->name = "AB8500 POn(PowerOn) Key"; | |
80 | input->dev.parent = &pdev->dev; | |
81 | ||
82 | input_set_capability(input, EV_KEY, KEY_POWER); | |
83 | ||
84 | error = request_any_context_irq(ponkey->irq_dbf, ab8500_ponkey_handler, | |
85 | 0, "ab8500-ponkey-dbf", ponkey); | |
86 | if (error < 0) { | |
87 | dev_err(ab8500->dev, "Failed to request dbf IRQ#%d: %d\n", | |
88 | ponkey->irq_dbf, error); | |
89 | goto err_free_mem; | |
90 | } | |
91 | ||
92 | error = request_any_context_irq(ponkey->irq_dbr, ab8500_ponkey_handler, | |
93 | 0, "ab8500-ponkey-dbr", ponkey); | |
94 | if (error < 0) { | |
95 | dev_err(ab8500->dev, "Failed to request dbr IRQ#%d: %d\n", | |
96 | ponkey->irq_dbr, error); | |
97 | goto err_free_dbf_irq; | |
98 | } | |
99 | ||
100 | error = input_register_device(ponkey->idev); | |
101 | if (error) { | |
102 | dev_err(ab8500->dev, "Can't register input device: %d\n", error); | |
103 | goto err_free_dbr_irq; | |
104 | } | |
105 | ||
106 | platform_set_drvdata(pdev, ponkey); | |
107 | return 0; | |
108 | ||
109 | err_free_dbr_irq: | |
c5fb514d | 110 | free_irq(ponkey->irq_dbr, ponkey); |
77686517 SI |
111 | err_free_dbf_irq: |
112 | free_irq(ponkey->irq_dbf, ponkey); | |
113 | err_free_mem: | |
114 | input_free_device(input); | |
115 | kfree(ponkey); | |
116 | ||
117 | return error; | |
118 | } | |
119 | ||
120 | static int __devexit ab8500_ponkey_remove(struct platform_device *pdev) | |
121 | { | |
122 | struct ab8500_ponkey *ponkey = platform_get_drvdata(pdev); | |
123 | ||
124 | free_irq(ponkey->irq_dbf, ponkey); | |
125 | free_irq(ponkey->irq_dbr, ponkey); | |
126 | input_unregister_device(ponkey->idev); | |
127 | kfree(ponkey); | |
128 | ||
129 | platform_set_drvdata(pdev, NULL); | |
130 | ||
131 | return 0; | |
132 | } | |
133 | ||
134 | static struct platform_driver ab8500_ponkey_driver = { | |
135 | .driver = { | |
136 | .name = "ab8500-poweron-key", | |
137 | .owner = THIS_MODULE, | |
138 | }, | |
139 | .probe = ab8500_ponkey_probe, | |
140 | .remove = __devexit_p(ab8500_ponkey_remove), | |
141 | }; | |
840a746b | 142 | module_platform_driver(ab8500_ponkey_driver); |
77686517 SI |
143 | |
144 | MODULE_LICENSE("GPL v2"); | |
145 | MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>"); | |
146 | MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver"); |