2 * Keyboard driver for Openmoko Freerunner GSM phone
4 * (C) 2006-2007 by Openmoko, Inc.
5 * Author: Harald Welte <laforge@openmoko.org>
8 * inspired by corkgbd.c by Richard Purdie
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
16 #include <linux/delay.h>
17 #include <linux/platform_device.h>
18 #include <linux/init.h>
19 #include <linux/input.h>
20 #include <linux/interrupt.h>
21 #include <linux/jiffies.h>
22 #include <linux/module.h>
23 #include <linux/slab.h>
25 #include <mach/gpio.h>
26 #include <asm/mach-types.h>
29 extern int global_inside_suspend;
31 #define global_inside_suspend 0
35 struct platform_device *pdev;
36 struct input_dev *input;
47 irqreturn_t (*isr)(int irq, void *dev_id);
52 static irqreturn_t gta02kbd_aux_irq(int irq, void *dev_id);
53 static irqreturn_t gta02kbd_default_key_irq(int irq, void *dev_id);
56 static struct gta02kbd_key keys[] = {
58 .name = "GTA02 AUX button",
59 .isr = gta02kbd_aux_irq,
60 .input_key = KEY_PHONE,
63 .name = "GTA02 HOLD button",
64 .isr = gta02kbd_default_key_irq,
65 .input_key = KEY_PAUSE,
69 /* This timer section filters AUX button IRQ bouncing */
71 static void aux_key_timer_f(unsigned long data);
73 static struct timer_list aux_key_timer =
74 TIMER_INITIALIZER(aux_key_timer_f, 0, 0);
76 #define AUX_TIMER_TIMEOUT (HZ >> 7)
77 #define AUX_TIMER_ALLOWED_NOOP 2
78 #define AUX_TIMER_CONSECUTIVE_EVENTS 5
80 struct gta02kbd *timer_kbd;
82 static void aux_key_timer_f(unsigned long data)
84 static int noop_counter;
85 static int last_key = -1;
86 static int last_count;
90 gpio_get_value(timer_kbd->pdev->resource[GTA02_KEY_AUX].start);
92 if (likely(key_pressed == last_key))
96 last_key = key_pressed;
99 if (unlikely(last_count >= AUX_TIMER_CONSECUTIVE_EVENTS)) {
100 if (timer_kbd->aux_state != last_key) {
101 input_report_key(timer_kbd->input, KEY_PHONE, last_key);
102 input_sync(timer_kbd->input);
104 timer_kbd->aux_state = last_key;
108 if (unlikely(++noop_counter > AUX_TIMER_ALLOWED_NOOP)) {
114 mod_timer(&aux_key_timer, jiffies + AUX_TIMER_TIMEOUT);
117 static irqreturn_t gta02kbd_aux_irq(int irq, void *dev)
119 mod_timer(&aux_key_timer, jiffies + AUX_TIMER_TIMEOUT);
124 static irqreturn_t gta02kbd_default_key_irq(int irq, void *dev_id)
126 struct gta02kbd *kbd = dev_id;
129 for (n = 0; n < ARRAY_SIZE(keys); n++) {
131 if (irq != keys[n].irq)
134 input_report_key(kbd->input, keys[n].input_key,
135 gpio_get_value(kbd->pdev->resource[n].start));
136 input_sync(kbd->input);
143 static int gta02kbd_suspend(struct platform_device *dev, pm_message_t state)
145 disable_irq(keys[GTA02_KEY_AUX].irq);
146 del_timer_sync(&aux_key_timer);
150 static int gta02kbd_resume(struct platform_device *dev)
152 enable_irq(keys[GTA02_KEY_AUX].irq);
156 #define gta02kbd_suspend NULL
157 #define gta02kbd_resume NULL
160 static int gta02kbd_probe(struct platform_device *pdev)
162 struct gta02kbd *gta02kbd;
163 struct input_dev *input_dev;
168 if (pdev->resource[0].flags != 0)
171 gta02kbd = kzalloc(sizeof(struct gta02kbd), GFP_KERNEL);
172 input_dev = input_allocate_device();
173 if (!gta02kbd || !input_dev) {
175 input_free_device(input_dev);
179 gta02kbd->pdev = pdev;
180 timer_kbd = gta02kbd;
182 platform_set_drvdata(pdev, gta02kbd);
184 gta02kbd->input = input_dev;
186 input_dev->name = "GTA02 Buttons";
187 input_dev->phys = "gta02kbd/input0";
188 input_dev->id.bustype = BUS_HOST;
189 input_dev->id.vendor = 0x0001;
190 input_dev->id.product = 0x0001;
191 input_dev->id.version = 0x0100;
192 input_dev->dev.parent = &pdev->dev;
194 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_SW);
195 set_bit(KEY_PHONE, input_dev->keybit);
196 set_bit(KEY_PAUSE, input_dev->keybit);
198 rc = input_register_device(gta02kbd->input);
202 /* register GPIO IRQs */
203 for(n = 0; n < min(pdev->num_resources, ARRAY_SIZE(keys)); n++) {
205 if (!pdev->resource[0].start)
208 irq = gpio_to_irq(pdev->resource[n].start);
212 if (request_irq(irq, keys[n].isr, IRQF_DISABLED |
213 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
214 keys[n].name, gta02kbd)) {
215 dev_err(&pdev->dev, "Can't get IRQ %u\n", irq);
217 /* unwind any irq registrations and fail */
221 free_irq(gpio_to_irq(pdev->resource[n].start),
224 goto out_device_create;
234 input_unregister_device(gta02kbd->input);
236 input_free_device(gta02kbd->input);
237 platform_set_drvdata(pdev, NULL);
243 static int gta02kbd_remove(struct platform_device *pdev)
245 struct gta02kbd *gta02kbd = platform_get_drvdata(pdev);
247 free_irq(gpio_to_irq(pdev->resource[1].start), gta02kbd);
248 free_irq(gpio_to_irq(pdev->resource[0].start), gta02kbd);
250 input_unregister_device(gta02kbd->input);
251 input_free_device(gta02kbd->input);
252 platform_set_drvdata(pdev, NULL);
258 static struct platform_driver gta02kbd_driver = {
259 .probe = gta02kbd_probe,
260 .remove = gta02kbd_remove,
261 .suspend = gta02kbd_suspend,
262 .resume = gta02kbd_resume,
264 .name = "gta02-button",
268 static int __devinit gta02kbd_init(void)
270 return platform_driver_register(>a02kbd_driver);
273 static void __exit gta02kbd_exit(void)
275 platform_driver_unregister(>a02kbd_driver);
278 module_init(gta02kbd_init);
279 module_exit(gta02kbd_exit);
281 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
282 MODULE_DESCRIPTION("Openmoko Freerunner buttons input driver");
283 MODULE_LICENSE("GPL");