Commit | Line | Data |
---|---|---|
09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
d9bdffd2 PS |
2 | /* |
3 | * Support for the S1 button on Routerboard 532 | |
4 | * | |
5 | * Copyright (C) 2009 Phil Sutter <n0-1@freewrt.org> | |
6 | */ | |
7 | ||
8 | #include <linux/input-polldev.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/platform_device.h> | |
832f5dac | 11 | #include <linux/gpio.h> |
d9bdffd2 PS |
12 | |
13 | #include <asm/mach-rc32434/gpio.h> | |
14 | #include <asm/mach-rc32434/rb.h> | |
15 | ||
16 | #define DRV_NAME "rb532-button" | |
17 | ||
18 | #define RB532_BTN_RATE 100 /* msec */ | |
19 | #define RB532_BTN_KSYM BTN_0 | |
20 | ||
21 | /* The S1 button state is provided by GPIO pin 1. But as this | |
22 | * pin is also used for uart input as alternate function, the | |
23 | * operational modes must be switched first: | |
24 | * 1) disable uart using set_latch_u5() | |
25 | * 2) turn off alternate function implicitly through | |
26 | * gpio_direction_input() | |
27 | * 3) read the GPIO's current value | |
28 | * 4) undo step 2 by enabling alternate function (in this | |
29 | * mode the GPIO direction is fixed, so no change needed) | |
30 | * 5) turn on uart again | |
31 | * The GPIO value occurs to be inverted, so pin high means | |
32 | * button is not pressed. | |
33 | */ | |
34 | static bool rb532_button_pressed(void) | |
35 | { | |
36 | int val; | |
37 | ||
38 | set_latch_u5(0, LO_FOFF); | |
39 | gpio_direction_input(GPIO_BTN_S1); | |
40 | ||
41 | val = gpio_get_value(GPIO_BTN_S1); | |
42 | ||
43 | rb532_gpio_set_func(GPIO_BTN_S1); | |
44 | set_latch_u5(LO_FOFF, 0); | |
45 | ||
46 | return !val; | |
47 | } | |
48 | ||
49 | static void rb532_button_poll(struct input_polled_dev *poll_dev) | |
50 | { | |
51 | input_report_key(poll_dev->input, RB532_BTN_KSYM, | |
52 | rb532_button_pressed()); | |
53 | input_sync(poll_dev->input); | |
54 | } | |
55 | ||
5298cc4c | 56 | static int rb532_button_probe(struct platform_device *pdev) |
d9bdffd2 PS |
57 | { |
58 | struct input_polled_dev *poll_dev; | |
59 | int error; | |
60 | ||
61 | poll_dev = input_allocate_polled_device(); | |
62 | if (!poll_dev) | |
63 | return -ENOMEM; | |
64 | ||
65 | poll_dev->poll = rb532_button_poll; | |
66 | poll_dev->poll_interval = RB532_BTN_RATE; | |
67 | ||
68 | poll_dev->input->name = "rb532 button"; | |
69 | poll_dev->input->phys = "rb532/button0"; | |
70 | poll_dev->input->id.bustype = BUS_HOST; | |
71 | poll_dev->input->dev.parent = &pdev->dev; | |
72 | ||
73 | dev_set_drvdata(&pdev->dev, poll_dev); | |
74 | ||
75 | input_set_capability(poll_dev->input, EV_KEY, RB532_BTN_KSYM); | |
76 | ||
77 | error = input_register_polled_device(poll_dev); | |
78 | if (error) { | |
79 | input_free_polled_device(poll_dev); | |
80 | return error; | |
81 | } | |
82 | ||
83 | return 0; | |
84 | } | |
85 | ||
e2619cf7 | 86 | static int rb532_button_remove(struct platform_device *pdev) |
d9bdffd2 PS |
87 | { |
88 | struct input_polled_dev *poll_dev = dev_get_drvdata(&pdev->dev); | |
89 | ||
90 | input_unregister_polled_device(poll_dev); | |
91 | input_free_polled_device(poll_dev); | |
d9bdffd2 PS |
92 | |
93 | return 0; | |
94 | } | |
95 | ||
96 | static struct platform_driver rb532_button_driver = { | |
97 | .probe = rb532_button_probe, | |
1cb0aa88 | 98 | .remove = rb532_button_remove, |
d9bdffd2 PS |
99 | .driver = { |
100 | .name = DRV_NAME, | |
d9bdffd2 PS |
101 | }, |
102 | }; | |
840a746b | 103 | module_platform_driver(rb532_button_driver); |
d9bdffd2 PS |
104 | |
105 | MODULE_AUTHOR("Phil Sutter <n0-1@freewrt.org>"); | |
106 | MODULE_LICENSE("GPL"); | |
107 | MODULE_DESCRIPTION("Support for S1 button on Routerboard 532"); | |
108 | MODULE_ALIAS("platform:" DRV_NAME); |