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Linux/drivers/input/misc/sgi_btns.c

  1 /*
  2  *  SGI Volume Button interface driver
  3  *
  4  *  Copyright (C) 2008  Thomas Bogendoerfer <tsbogend@alpha.franken.de>
  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 as published by
  8  *  the Free Software Foundation; either version 2 of the License, or
  9  *  (at your option) any later version.
 10  *
 11  *  This program is distributed in the hope that it will be useful,
 12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  *  GNU General Public License for more details.
 15  *
 16  *  You should have received a copy of the GNU General Public License
 17  *  along with this program; if not, write to the Free Software
 18  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 19  */
 20 #include <linux/input-polldev.h>
 21 #include <linux/ioport.h>
 22 #include <linux/module.h>
 23 #include <linux/platform_device.h>
 24 #include <linux/slab.h>
 25 
 26 #ifdef CONFIG_SGI_IP22
 27 #include <asm/sgi/ioc.h>
 28 
 29 static inline u8 button_status(void)
 30 {
 31         u8 status;
 32 
 33         status = readb(&sgioc->panel) ^ 0xa0;
 34         return ((status & 0x80) >> 6) | ((status & 0x20) >> 5);
 35 }
 36 #endif
 37 
 38 #ifdef CONFIG_SGI_IP32
 39 #include <asm/ip32/mace.h>
 40 
 41 static inline u8 button_status(void)
 42 {
 43         u64 status;
 44 
 45         status = readq(&mace->perif.audio.control);
 46         writeq(status & ~(3U << 23), &mace->perif.audio.control);
 47 
 48         return (status >> 23) & 3;
 49 }
 50 #endif
 51 
 52 #define BUTTONS_POLL_INTERVAL   30      /* msec */
 53 #define BUTTONS_COUNT_THRESHOLD 3
 54 
 55 static const unsigned short sgi_map[] = {
 56         KEY_VOLUMEDOWN,
 57         KEY_VOLUMEUP
 58 };
 59 
 60 struct buttons_dev {
 61         struct input_polled_dev *poll_dev;
 62         unsigned short keymap[ARRAY_SIZE(sgi_map)];
 63         int count[ARRAY_SIZE(sgi_map)];
 64 };
 65 
 66 static void handle_buttons(struct input_polled_dev *dev)
 67 {
 68         struct buttons_dev *bdev = dev->private;
 69         struct input_dev *input = dev->input;
 70         u8 status;
 71         int i;
 72 
 73         status = button_status();
 74 
 75         for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) {
 76                 if (status & (1U << i)) {
 77                         if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) {
 78                                 input_event(input, EV_MSC, MSC_SCAN, i);
 79                                 input_report_key(input, bdev->keymap[i], 1);
 80                                 input_sync(input);
 81                         }
 82                 } else {
 83                         if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) {
 84                                 input_event(input, EV_MSC, MSC_SCAN, i);
 85                                 input_report_key(input, bdev->keymap[i], 0);
 86                                 input_sync(input);
 87                         }
 88                         bdev->count[i] = 0;
 89                 }
 90         }
 91 }
 92 
 93 static int sgi_buttons_probe(struct platform_device *pdev)
 94 {
 95         struct buttons_dev *bdev;
 96         struct input_polled_dev *poll_dev;
 97         struct input_dev *input;
 98         int error, i;
 99 
100         bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL);
101         poll_dev = input_allocate_polled_device();
102         if (!bdev || !poll_dev) {
103                 error = -ENOMEM;
104                 goto err_free_mem;
105         }
106 
107         memcpy(bdev->keymap, sgi_map, sizeof(bdev->keymap));
108 
109         poll_dev->private = bdev;
110         poll_dev->poll = handle_buttons;
111         poll_dev->poll_interval = BUTTONS_POLL_INTERVAL;
112 
113         input = poll_dev->input;
114         input->name = "SGI buttons";
115         input->phys = "sgi/input0";
116         input->id.bustype = BUS_HOST;
117         input->dev.parent = &pdev->dev;
118 
119         input->keycode = bdev->keymap;
120         input->keycodemax = ARRAY_SIZE(bdev->keymap);
121         input->keycodesize = sizeof(unsigned short);
122 
123         input_set_capability(input, EV_MSC, MSC_SCAN);
124         __set_bit(EV_KEY, input->evbit);
125         for (i = 0; i < ARRAY_SIZE(sgi_map); i++)
126                 __set_bit(bdev->keymap[i], input->keybit);
127         __clear_bit(KEY_RESERVED, input->keybit);
128 
129         bdev->poll_dev = poll_dev;
130         platform_set_drvdata(pdev, bdev);
131 
132         error = input_register_polled_device(poll_dev);
133         if (error)
134                 goto err_free_mem;
135 
136         return 0;
137 
138  err_free_mem:
139         input_free_polled_device(poll_dev);
140         kfree(bdev);
141         return error;
142 }
143 
144 static int sgi_buttons_remove(struct platform_device *pdev)
145 {
146         struct buttons_dev *bdev = platform_get_drvdata(pdev);
147 
148         input_unregister_polled_device(bdev->poll_dev);
149         input_free_polled_device(bdev->poll_dev);
150         kfree(bdev);
151 
152         return 0;
153 }
154 
155 static struct platform_driver sgi_buttons_driver = {
156         .probe  = sgi_buttons_probe,
157         .remove = sgi_buttons_remove,
158         .driver = {
159                 .name   = "sgibtns",
160                 .owner  = THIS_MODULE,
161         },
162 };
163 module_platform_driver(sgi_buttons_driver);
164 
165 MODULE_LICENSE("GPL");
166 

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