443 lines
10 KiB
C
443 lines
10 KiB
C
/*
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* Keyboard driver for Openmoko Freerunner GSM phone
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*
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* (C) 2006-2007 by Openmoko, Inc.
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* Author: Harald Welte <laforge@openmoko.org>
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* All rights reserved.
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*
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* inspired by corkgbd.c by Richard Purdie
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/init.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/jiffies.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include <mach/gpio.h>
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#include <asm/mach-types.h>
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#ifdef CONFIG_PM
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extern int global_inside_suspend;
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#else
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#define global_inside_suspend 0
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#endif
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struct gta02kbd {
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struct platform_device *pdev;
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struct input_dev *input;
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struct device *cdev;
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struct work_struct work;
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int aux_state;
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int work_in_progress;
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int hp_irq_count_in_work;
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int hp_irq_count;
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int jack_irq;
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};
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static struct class *gta02kbd_switch_class;
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enum keys {
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GTA02_KEY_AUX,
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GTA02_KEY_HOLD,
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GTA02_KEY_JACK,
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};
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struct gta02kbd_key {
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const char * name;
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irqreturn_t (*isr)(int irq, void *dev_id);
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int irq;
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int input_key;
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};
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static irqreturn_t gta02kbd_aux_irq(int irq, void *dev_id);
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static irqreturn_t gta02kbd_headphone_irq(int irq, void *dev_id);
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static irqreturn_t gta02kbd_default_key_irq(int irq, void *dev_id);
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static struct gta02kbd_key keys[] = {
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[GTA02_KEY_AUX] = {
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.name = "GTA02 AUX button",
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.isr = gta02kbd_aux_irq,
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.input_key = KEY_PHONE,
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},
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[GTA02_KEY_HOLD] = {
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.name = "GTA02 HOLD button",
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.isr = gta02kbd_default_key_irq,
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.input_key = KEY_PAUSE,
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},
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[GTA02_KEY_JACK] = {
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.name = "GTA02 Headphone jack",
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.isr = gta02kbd_headphone_irq,
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},
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};
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/* This timer section filters AUX button IRQ bouncing */
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static void aux_key_timer_f(unsigned long data);
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static struct timer_list aux_key_timer =
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TIMER_INITIALIZER(aux_key_timer_f, 0, 0);
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#define AUX_TIMER_TIMEOUT (HZ >> 7)
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#define AUX_TIMER_ALLOWED_NOOP 2
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#define AUX_TIMER_CONSECUTIVE_EVENTS 5
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struct gta02kbd *timer_kbd;
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static void aux_key_timer_f(unsigned long data)
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{
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static int noop_counter;
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static int last_key = -1;
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static int last_count;
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int key_pressed;
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key_pressed =
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gpio_get_value(timer_kbd->pdev->resource[GTA02_KEY_AUX].start);
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if (likely(key_pressed == last_key))
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last_count++;
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else {
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last_count = 1;
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last_key = key_pressed;
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}
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if (unlikely(last_count >= AUX_TIMER_CONSECUTIVE_EVENTS)) {
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if (timer_kbd->aux_state != last_key) {
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input_report_key(timer_kbd->input, KEY_PHONE, last_key);
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input_sync(timer_kbd->input);
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timer_kbd->aux_state = last_key;
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noop_counter = 0;
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}
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last_count = 0;
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if (unlikely(++noop_counter > AUX_TIMER_ALLOWED_NOOP)) {
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noop_counter = 0;
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return;
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}
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}
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mod_timer(&aux_key_timer, jiffies + AUX_TIMER_TIMEOUT);
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}
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static irqreturn_t gta02kbd_aux_irq(int irq, void *dev)
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{
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mod_timer(&aux_key_timer, jiffies + AUX_TIMER_TIMEOUT);
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return IRQ_HANDLED;
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}
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static irqreturn_t gta02kbd_default_key_irq(int irq, void *dev_id)
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{
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struct gta02kbd *kbd = dev_id;
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int n;
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for (n = 0; n < ARRAY_SIZE(keys); n++) {
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if (irq != keys[n].irq)
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continue;
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input_report_key(kbd->input, keys[n].input_key,
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gpio_get_value(kbd->pdev->resource[n].start));
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input_sync(kbd->input);
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}
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return IRQ_HANDLED;
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}
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static const char *event_array_jack[2][4] = {
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[0] = {
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"SWITCH_NAME=headset",
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"SWITCH_STATE=0",
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"EVENT=remove",
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NULL
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},
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[1] = {
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"SWITCH_NAME=headset",
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"SWITCH_STATE=1",
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"EVENT=insert",
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NULL
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},
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};
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static void gta02kbd_jack_event(struct device *dev, int num)
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{
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kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, (char **)event_array_jack[!!num]);
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}
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static void gta02kbd_debounce_jack(struct work_struct *work)
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{
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struct gta02kbd *kbd = container_of(work, struct gta02kbd, work);
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unsigned long flags;
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int loop = 0;
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int level;
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do {
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/*
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* we wait out any multiple interrupt
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* stuttering in 100ms lumps
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*/
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do {
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kbd->hp_irq_count_in_work = kbd->hp_irq_count;
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msleep(100);
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} while (kbd->hp_irq_count != kbd->hp_irq_count_in_work);
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/*
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* no new interrupts on jack for 100ms...
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* ok we will report it
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*/
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level = gpio_get_value(kbd->pdev->resource[GTA02_KEY_JACK].start);
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input_report_switch(kbd->input, SW_HEADPHONE_INSERT, level);
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input_sync(kbd->input);
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gta02kbd_jack_event(kbd->cdev, level);
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/*
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* we go around the outer loop again if we detect that more
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* interrupts came while we are servicing here. But we have
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* to sequence it carefully with interrupts off
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*/
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local_save_flags(flags);
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/* no interrupts during this work means we can exit the work */
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loop = !!(kbd->hp_irq_count != kbd->hp_irq_count_in_work);
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if (!loop)
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kbd->work_in_progress = 0;
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local_irq_restore(flags);
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/*
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* interrupt that comes here will either queue a new work action
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* since work_in_progress is cleared now, or be dealt with
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* when we loop.
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*/
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} while (loop);
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}
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static irqreturn_t gta02kbd_headphone_irq(int irq, void *dev_id)
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{
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struct gta02kbd *gta02kbd_data = dev_id;
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/*
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* this interrupt is prone to bouncing and userspace doesn't like
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* to have to deal with that kind of thing. So we do not accept
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* that a jack interrupt is equal to a jack event. Instead we fire
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* some work on the first interrupt, and it hangs about in 100ms units
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* until no more interrupts come. Then it accepts the state it finds
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* for jack insert and reports it once
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*/
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gta02kbd_data->hp_irq_count++;
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/*
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* the first interrupt we see for a while, we fire the work item
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* and record the interrupt count when we did that. If more interrupts
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* come in the meanwhile, we can tell by the difference in that
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* stored count and hp_irq_count which increments every interrupt
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*/
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if (!gta02kbd_data->work_in_progress) {
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gta02kbd_data->jack_irq = irq;
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gta02kbd_data->hp_irq_count_in_work =
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gta02kbd_data->hp_irq_count;
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if (!schedule_work(>a02kbd_data->work))
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printk(KERN_ERR
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"Unable to schedule headphone debounce\n");
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else
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gta02kbd_data->work_in_progress = 1;
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}
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return IRQ_HANDLED;
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}
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#ifdef CONFIG_PM
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static int gta02kbd_suspend(struct platform_device *dev, pm_message_t state)
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{
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disable_irq(keys[GTA02_KEY_AUX].irq);
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del_timer_sync(&aux_key_timer);
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return 0;
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}
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static int gta02kbd_resume(struct platform_device *dev)
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{
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enable_irq(keys[GTA02_KEY_AUX].irq);
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return 0;
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}
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#else
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#define gta02kbd_suspend NULL
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#define gta02kbd_resume NULL
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#endif
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static ssize_t gta02kbd_switch_name_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%s\n", "gta02 Headset Jack");
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}
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static ssize_t gta02kbd_switch_state_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct gta02kbd *kbd = dev_get_drvdata(dev);
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return sprintf(buf, "%d\n",
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gpio_get_value(kbd->pdev->resource[GTA02_KEY_JACK].start));
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}
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static DEVICE_ATTR(name, S_IRUGO , gta02kbd_switch_name_show, NULL);
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static DEVICE_ATTR(state, S_IRUGO , gta02kbd_switch_state_show, NULL);
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static int gta02kbd_probe(struct platform_device *pdev)
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{
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struct gta02kbd *gta02kbd;
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struct input_dev *input_dev;
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int rc;
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int irq;
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int n;
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gta02kbd = kzalloc(sizeof(struct gta02kbd), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!gta02kbd || !input_dev) {
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kfree(gta02kbd);
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input_free_device(input_dev);
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return -ENOMEM;
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}
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gta02kbd->pdev = pdev;
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timer_kbd = gta02kbd;
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if (pdev->resource[0].flags != 0)
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return -EINVAL;
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platform_set_drvdata(pdev, gta02kbd);
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gta02kbd->input = input_dev;
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INIT_WORK(>a02kbd->work, gta02kbd_debounce_jack);
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input_dev->name = "GTA02 Buttons";
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input_dev->phys = "gta02kbd/input0";
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input_dev->id.bustype = BUS_HOST;
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input_dev->id.vendor = 0x0001;
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input_dev->id.product = 0x0001;
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input_dev->id.version = 0x0100;
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input_dev->dev.parent = &pdev->dev;
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input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_SW);
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set_bit(SW_HEADPHONE_INSERT, input_dev->swbit);
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set_bit(KEY_PHONE, input_dev->keybit);
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set_bit(KEY_PAUSE, input_dev->keybit);
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rc = input_register_device(gta02kbd->input);
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if (rc)
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goto out_register;
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gta02kbd->cdev = device_create(gta02kbd_switch_class,
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&pdev->dev, 0, gta02kbd, "headset");
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if (unlikely(IS_ERR(gta02kbd->cdev))) {
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rc = PTR_ERR(gta02kbd->cdev);
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goto out_device_create;
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}
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rc = device_create_file(gta02kbd->cdev, &dev_attr_name);
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if(rc)
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goto out_device_create_file;
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rc = device_create_file(gta02kbd->cdev, &dev_attr_state);
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if(rc)
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goto out_device_create_file;
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/* register GPIO IRQs */
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for(n = 0; n < min(pdev->num_resources, ARRAY_SIZE(keys)); n++) {
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if (!pdev->resource[0].start)
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continue;
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irq = gpio_to_irq(pdev->resource[n].start);
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if (irq < 0)
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continue;
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if (request_irq(irq, keys[n].isr, IRQF_DISABLED |
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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keys[n].name, gta02kbd)) {
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dev_err(&pdev->dev, "Can't get IRQ %u\n", irq);
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/* unwind any irq registrations and fail */
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while (n > 0) {
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n--;
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free_irq(gpio_to_irq(pdev->resource[n].start),
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gta02kbd);
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}
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goto out_device_create_file;
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}
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keys[n].irq = irq;
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}
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enable_irq_wake(keys[GTA02_KEY_JACK].irq);
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return 0;
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out_device_create_file:
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device_unregister(gta02kbd->cdev);
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out_device_create:
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input_unregister_device(gta02kbd->input);
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out_register:
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input_free_device(gta02kbd->input);
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platform_set_drvdata(pdev, NULL);
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kfree(gta02kbd);
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return -ENODEV;
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}
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static int gta02kbd_remove(struct platform_device *pdev)
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{
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struct gta02kbd *gta02kbd = platform_get_drvdata(pdev);
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free_irq(gpio_to_irq(pdev->resource[2].start), gta02kbd);
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free_irq(gpio_to_irq(pdev->resource[1].start), gta02kbd);
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free_irq(gpio_to_irq(pdev->resource[0].start), gta02kbd);
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device_unregister(gta02kbd->cdev);
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input_unregister_device(gta02kbd->input);
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input_free_device(gta02kbd->input);
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platform_set_drvdata(pdev, NULL);
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kfree(gta02kbd);
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return 0;
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}
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static struct platform_driver gta02kbd_driver = {
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.probe = gta02kbd_probe,
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.remove = gta02kbd_remove,
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.suspend = gta02kbd_suspend,
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.resume = gta02kbd_resume,
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.driver = {
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.name = "gta02-button",
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},
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};
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static int __devinit gta02kbd_init(void)
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{
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gta02kbd_switch_class = class_create(THIS_MODULE, "switch");
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if (IS_ERR(gta02kbd_switch_class))
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return PTR_ERR(gta02kbd_switch_class);
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return platform_driver_register(>a02kbd_driver);
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}
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static void __exit gta02kbd_exit(void)
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{
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platform_driver_unregister(>a02kbd_driver);
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class_destroy(gta02kbd_switch_class);
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}
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module_init(gta02kbd_init);
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module_exit(gta02kbd_exit);
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MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
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MODULE_DESCRIPTION("Openmoko Freerunner buttons input driver");
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MODULE_LICENSE("GPL");
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