Phil Sutter | d9bdffd | 2009-03-04 23:27:15 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Support for the S1 button on Routerboard 532 |
| 3 | * |
| 4 | * Copyright (C) 2009 Phil Sutter <n0-1@freewrt.org> |
| 5 | */ |
| 6 | |
| 7 | #include <linux/input-polldev.h> |
| 8 | #include <linux/module.h> |
| 9 | #include <linux/platform_device.h> |
| 10 | |
| 11 | #include <asm/mach-rc32434/gpio.h> |
| 12 | #include <asm/mach-rc32434/rb.h> |
| 13 | |
| 14 | #define DRV_NAME "rb532-button" |
| 15 | |
| 16 | #define RB532_BTN_RATE 100 /* msec */ |
| 17 | #define RB532_BTN_KSYM BTN_0 |
| 18 | |
| 19 | /* The S1 button state is provided by GPIO pin 1. But as this |
| 20 | * pin is also used for uart input as alternate function, the |
| 21 | * operational modes must be switched first: |
| 22 | * 1) disable uart using set_latch_u5() |
| 23 | * 2) turn off alternate function implicitly through |
| 24 | * gpio_direction_input() |
| 25 | * 3) read the GPIO's current value |
| 26 | * 4) undo step 2 by enabling alternate function (in this |
| 27 | * mode the GPIO direction is fixed, so no change needed) |
| 28 | * 5) turn on uart again |
| 29 | * The GPIO value occurs to be inverted, so pin high means |
| 30 | * button is not pressed. |
| 31 | */ |
| 32 | static bool rb532_button_pressed(void) |
| 33 | { |
| 34 | int val; |
| 35 | |
| 36 | set_latch_u5(0, LO_FOFF); |
| 37 | gpio_direction_input(GPIO_BTN_S1); |
| 38 | |
| 39 | val = gpio_get_value(GPIO_BTN_S1); |
| 40 | |
| 41 | rb532_gpio_set_func(GPIO_BTN_S1); |
| 42 | set_latch_u5(LO_FOFF, 0); |
| 43 | |
| 44 | return !val; |
| 45 | } |
| 46 | |
| 47 | static void rb532_button_poll(struct input_polled_dev *poll_dev) |
| 48 | { |
| 49 | input_report_key(poll_dev->input, RB532_BTN_KSYM, |
| 50 | rb532_button_pressed()); |
| 51 | input_sync(poll_dev->input); |
| 52 | } |
| 53 | |
| 54 | static int __devinit rb532_button_probe(struct platform_device *pdev) |
| 55 | { |
| 56 | struct input_polled_dev *poll_dev; |
| 57 | int error; |
| 58 | |
| 59 | poll_dev = input_allocate_polled_device(); |
| 60 | if (!poll_dev) |
| 61 | return -ENOMEM; |
| 62 | |
| 63 | poll_dev->poll = rb532_button_poll; |
| 64 | poll_dev->poll_interval = RB532_BTN_RATE; |
| 65 | |
| 66 | poll_dev->input->name = "rb532 button"; |
| 67 | poll_dev->input->phys = "rb532/button0"; |
| 68 | poll_dev->input->id.bustype = BUS_HOST; |
| 69 | poll_dev->input->dev.parent = &pdev->dev; |
| 70 | |
| 71 | dev_set_drvdata(&pdev->dev, poll_dev); |
| 72 | |
| 73 | input_set_capability(poll_dev->input, EV_KEY, RB532_BTN_KSYM); |
| 74 | |
| 75 | error = input_register_polled_device(poll_dev); |
| 76 | if (error) { |
| 77 | input_free_polled_device(poll_dev); |
| 78 | return error; |
| 79 | } |
| 80 | |
| 81 | return 0; |
| 82 | } |
| 83 | |
| 84 | static int __devexit rb532_button_remove(struct platform_device *pdev) |
| 85 | { |
| 86 | struct input_polled_dev *poll_dev = dev_get_drvdata(&pdev->dev); |
| 87 | |
| 88 | input_unregister_polled_device(poll_dev); |
| 89 | input_free_polled_device(poll_dev); |
| 90 | dev_set_drvdata(&pdev->dev, NULL); |
| 91 | |
| 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | static struct platform_driver rb532_button_driver = { |
| 96 | .probe = rb532_button_probe, |
Bill Pemberton | 1cb0aa8 | 2012-11-23 21:27:39 -0800 | [diff] [blame^] | 97 | .remove = rb532_button_remove, |
Phil Sutter | d9bdffd | 2009-03-04 23:27:15 -0800 | [diff] [blame] | 98 | .driver = { |
| 99 | .name = DRV_NAME, |
| 100 | .owner = THIS_MODULE, |
| 101 | }, |
| 102 | }; |
JJ Ding | 840a746 | 2011-11-29 11:08:40 -0800 | [diff] [blame] | 103 | module_platform_driver(rb532_button_driver); |
Phil Sutter | d9bdffd | 2009-03-04 23:27:15 -0800 | [diff] [blame] | 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); |