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Linux/drivers/input/misc/cobalt_btns.c

  1 /*
  2  *  Cobalt button interface driver.
  3  *
  4  *  Copyright (C) 2007-2008  Yoichi Yuasa <yuasa@linux-mips.org>
  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 #define BUTTONS_POLL_INTERVAL   30      /* msec */
 27 #define BUTTONS_COUNT_THRESHOLD 3
 28 #define BUTTONS_STATUS_MASK     0xfe000000
 29 
 30 static const unsigned short cobalt_map[] = {
 31         KEY_RESERVED,
 32         KEY_RESTART,
 33         KEY_LEFT,
 34         KEY_UP,
 35         KEY_DOWN,
 36         KEY_RIGHT,
 37         KEY_ENTER,
 38         KEY_SELECT
 39 };
 40 
 41 struct buttons_dev {
 42         struct input_polled_dev *poll_dev;
 43         unsigned short keymap[ARRAY_SIZE(cobalt_map)];
 44         int count[ARRAY_SIZE(cobalt_map)];
 45         void __iomem *reg;
 46 };
 47 
 48 static void handle_buttons(struct input_polled_dev *dev)
 49 {
 50         struct buttons_dev *bdev = dev->private;
 51         struct input_dev *input = dev->input;
 52         uint32_t status;
 53         int i;
 54 
 55         status = ~readl(bdev->reg) >> 24;
 56 
 57         for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) {
 58                 if (status & (1U << i)) {
 59                         if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) {
 60                                 input_event(input, EV_MSC, MSC_SCAN, i);
 61                                 input_report_key(input, bdev->keymap[i], 1);
 62                                 input_sync(input);
 63                         }
 64                 } else {
 65                         if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) {
 66                                 input_event(input, EV_MSC, MSC_SCAN, i);
 67                                 input_report_key(input, bdev->keymap[i], 0);
 68                                 input_sync(input);
 69                         }
 70                         bdev->count[i] = 0;
 71                 }
 72         }
 73 }
 74 
 75 static int cobalt_buttons_probe(struct platform_device *pdev)
 76 {
 77         struct buttons_dev *bdev;
 78         struct input_polled_dev *poll_dev;
 79         struct input_dev *input;
 80         struct resource *res;
 81         int error, i;
 82 
 83         bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL);
 84         poll_dev = input_allocate_polled_device();
 85         if (!bdev || !poll_dev) {
 86                 error = -ENOMEM;
 87                 goto err_free_mem;
 88         }
 89 
 90         memcpy(bdev->keymap, cobalt_map, sizeof(bdev->keymap));
 91 
 92         poll_dev->private = bdev;
 93         poll_dev->poll = handle_buttons;
 94         poll_dev->poll_interval = BUTTONS_POLL_INTERVAL;
 95 
 96         input = poll_dev->input;
 97         input->name = "Cobalt buttons";
 98         input->phys = "cobalt/input0";
 99         input->id.bustype = BUS_HOST;
100         input->dev.parent = &pdev->dev;
101 
102         input->keycode = bdev->keymap;
103         input->keycodemax = ARRAY_SIZE(bdev->keymap);
104         input->keycodesize = sizeof(unsigned short);
105 
106         input_set_capability(input, EV_MSC, MSC_SCAN);
107         __set_bit(EV_KEY, input->evbit);
108         for (i = 0; i < ARRAY_SIZE(cobalt_map); i++)
109                 __set_bit(bdev->keymap[i], input->keybit);
110         __clear_bit(KEY_RESERVED, input->keybit);
111 
112         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
113         if (!res) {
114                 error = -EBUSY;
115                 goto err_free_mem;
116         }
117 
118         bdev->poll_dev = poll_dev;
119         bdev->reg = ioremap(res->start, resource_size(res));
120         dev_set_drvdata(&pdev->dev, bdev);
121 
122         error = input_register_polled_device(poll_dev);
123         if (error)
124                 goto err_iounmap;
125 
126         return 0;
127 
128  err_iounmap:
129         iounmap(bdev->reg);
130  err_free_mem:
131         input_free_polled_device(poll_dev);
132         kfree(bdev);
133         return error;
134 }
135 
136 static int cobalt_buttons_remove(struct platform_device *pdev)
137 {
138         struct device *dev = &pdev->dev;
139         struct buttons_dev *bdev = dev_get_drvdata(dev);
140 
141         input_unregister_polled_device(bdev->poll_dev);
142         input_free_polled_device(bdev->poll_dev);
143         iounmap(bdev->reg);
144         kfree(bdev);
145 
146         return 0;
147 }
148 
149 MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>");
150 MODULE_DESCRIPTION("Cobalt button interface driver");
151 MODULE_LICENSE("GPL");
152 /* work with hotplug and coldplug */
153 MODULE_ALIAS("platform:Cobalt buttons");
154 
155 static struct platform_driver cobalt_buttons_driver = {
156         .probe  = cobalt_buttons_probe,
157         .remove = cobalt_buttons_remove,
158         .driver = {
159                 .name   = "Cobalt buttons",
160                 .owner  = THIS_MODULE,
161         },
162 };
163 module_platform_driver(cobalt_buttons_driver);
164 

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