err.no Git - linux-2.6/blob - drivers/input/misc/cobalt_btns.c

   1 /*
   2  *  Cobalt button interface driver.
   3  *
   4  *  Copyright (C) 2007  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
   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/init.h>
  21 #include <linux/input.h>
  22 #include <linux/ioport.h>
  23 #include <linux/module.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/jiffies.h>
  26 #include <linux/timer.h>
  27
  28 #define BUTTONS_POLL_INTERVAL   30      /* msec */
  29 #define BUTTONS_COUNT_THRESHOLD 3
  30 #define BUTTONS_STATUS_MASK     0xfe000000
  31
  32 struct buttons_dev {
  33         struct input_dev *input;
  34         void __iomem *reg;
  35 };
  36
  37 struct buttons_map {
  38         uint32_t mask;
  39         int keycode;
  40         int count;
  41 };
  42
  43 static struct buttons_map buttons_map[] = {
  44         { 0x02000000, KEY_RESTART, },
  45         { 0x04000000, KEY_LEFT, },
  46         { 0x08000000, KEY_UP, },
  47         { 0x10000000, KEY_DOWN, },
  48         { 0x20000000, KEY_RIGHT, },
  49         { 0x40000000, KEY_ENTER, },
  50         { 0x80000000, KEY_SELECT, },
  51 };
  52
  53 static struct resource cobalt_buttons_resource __initdata = {
  54         .start  = 0x1d000000,
  55         .end    = 0x1d000003,
  56         .flags  = IORESOURCE_MEM,
  57 };
  58
  59 static struct platform_device *cobalt_buttons_device;
  60
  61 static struct timer_list buttons_timer;
  62
  63 static void handle_buttons(unsigned long data)
  64 {
  65         struct buttons_map *button = buttons_map;
  66         struct buttons_dev *bdev;
  67         uint32_t status;
  68         int i;
  69
  70         bdev = (struct buttons_dev *)data;
  71         status = readl(bdev->reg);
  72         status = ~status & BUTTONS_STATUS_MASK;
  73
  74         for (i = 0; i < ARRAY_SIZE(buttons_map); i++) {
  75                 if (status & button->mask) {
  76                         button->count++;
  77                 } else {
  78                         if (button->count >= BUTTONS_COUNT_THRESHOLD) {
  79                                 input_report_key(bdev->input, button->keycode, 0);
  80                                 input_sync(bdev->input);
  81                         }
  82                         button->count = 0;
  83                 }
  84
  85                 if (button->count == BUTTONS_COUNT_THRESHOLD) {
  86                         input_report_key(bdev->input, button->keycode, 1);
  87                         input_sync(bdev->input);
  88                 }
  89
  90                 button++;
  91         }
  92
  93         mod_timer(&buttons_timer, jiffies + msecs_to_jiffies(BUTTONS_POLL_INTERVAL));
  94 }
  95
  96 static int cobalt_buttons_open(struct input_dev *dev)
  97 {
  98         mod_timer(&buttons_timer, jiffies + msecs_to_jiffies(BUTTONS_POLL_INTERVAL));
  99
 100         return 0;
 101 }
 102
 103 static void cobalt_buttons_close(struct input_dev *dev)
 104 {
 105         del_timer_sync(&buttons_timer);
 106 }
 107
 108 static int __devinit cobalt_buttons_probe(struct platform_device *pdev)
 109 {
 110         struct buttons_dev *bdev;
 111         struct input_dev *input;
 112         struct resource *res;
 113         int error, i;
 114
 115         bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL);
 116         input = input_allocate_device();
 117         if (!bdev || !input) {
 118                 error = -ENOMEM;
 119                 goto err_free_mem;
 120         }
 121
 122         input->name = "Cobalt buttons";
 123         input->phys = "cobalt/input0";
 124         input->id.bustype = BUS_HOST;
 125         input->cdev.dev = &pdev->dev;
 126         input->open = cobalt_buttons_open;
 127         input->close = cobalt_buttons_close;
 128
 129         input->evbit[0] = BIT(EV_KEY);
 130         for (i = 0; i < ARRAY_SIZE(buttons_map); i++) {
 131                 set_bit(buttons_map[i].keycode, input->keybit);
 132                 buttons_map[i].count = 0;
 133         }
 134
 135         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 136         if (!res) {
 137                 error = -EBUSY;
 138                 goto err_free_mem;
 139         }
 140
 141         bdev->input = input;
 142         bdev->reg = ioremap(res->start, res->end - res->start + 1);
 143         dev_set_drvdata(&pdev->dev, bdev);
 144
 145         setup_timer(&buttons_timer, handle_buttons, (unsigned long)bdev);
 146
 147         error = input_register_device(input);
 148         if (error)
 149                 goto err_iounmap;
 150
 151         return 0;
 152
 153  err_iounmap:
 154         iounmap(bdev->reg);
 155  err_free_mem:
 156         input_free_device(input);
 157         kfree(bdev);
 158         dev_set_drvdata(&pdev->dev, NULL);
 159         return error;
 160 }
 161
 162 static int __devexit cobalt_buttons_remove(struct platform_device *pdev)
 163 {
 164         struct device *dev = &pdev->dev;
 165         struct buttons_dev *bdev = dev_get_drvdata(dev);
 166
 167         input_unregister_device(bdev->input);
 168         iounmap(bdev->reg);
 169         kfree(bdev);
 170         dev_set_drvdata(dev, NULL);
 171
 172         return 0;
 173 }
 174
 175 static struct platform_driver cobalt_buttons_driver = {
 176         .probe  = cobalt_buttons_probe,
 177         .remove = __devexit_p(cobalt_buttons_remove),
 178         .driver = {
 179                 .name   = "Cobalt buttons",
 180                 .owner  = THIS_MODULE,
 181         },
 182 };
 183
 184 static int __init cobalt_buttons_init(void)
 185 {
 186         int retval;
 187
 188         cobalt_buttons_device = platform_device_register_simple("Cobalt buttons", -1,
 189                                                                 &cobalt_buttons_resource, 1);
 190         if (IS_ERR(cobalt_buttons_device)) {
 191                 retval = PTR_ERR(cobalt_buttons_device);
 192                 return retval;
 193         }
 194
 195         retval = platform_driver_register(&cobalt_buttons_driver);
 196         if (retval < 0)
 197                 platform_device_unregister(cobalt_buttons_device);
 198
 199         return retval;
 200 }
 201
 202 static void __exit cobalt_buttons_exit(void)
 203 {
 204         platform_driver_unregister(&cobalt_buttons_driver);
 205         platform_device_unregister(cobalt_buttons_device);
 206 }
 207
 208 module_init(cobalt_buttons_init);
 209 module_exit(cobalt_buttons_exit);