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-rw-r--r--target/linux/goldfish/patches-2.6.30/0086-Input-Generic-GPIO-Input-device.patch1460
1 files changed, 1460 insertions, 0 deletions
diff --git a/target/linux/goldfish/patches-2.6.30/0086-Input-Generic-GPIO-Input-device.patch b/target/linux/goldfish/patches-2.6.30/0086-Input-Generic-GPIO-Input-device.patch
new file mode 100644
index 0000000000..1025633802
--- /dev/null
+++ b/target/linux/goldfish/patches-2.6.30/0086-Input-Generic-GPIO-Input-device.patch
@@ -0,0 +1,1460 @@
+From 6730377482c05a1742abb92f1463701f5d084a27 Mon Sep 17 00:00:00 2001
+From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@android.com>
+Date: Wed, 15 Oct 2008 18:23:47 -0700
+Subject: [PATCH 086/134] Input: Generic GPIO Input device.
+MIME-Version: 1.0
+Content-Type: text/plain; charset=utf-8
+Content-Transfer-Encoding: 8bit
+
+Supports keyboard matrixces, direct inputs, direct outputs and axes connected to gpios.
+
+Signed-off-by: Arve Hjønnevåg <arve@android.com>
+Signed-off-by: Nick Pelly <npelly@google.com>
+---
+ drivers/input/misc/Kconfig | 5 +
+ drivers/input/misc/Makefile | 1 +
+ drivers/input/misc/gpio_axis.c | 180 +++++++++++++++++
+ drivers/input/misc/gpio_event.c | 224 +++++++++++++++++++++
+ drivers/input/misc/gpio_input.c | 343 ++++++++++++++++++++++++++++++++
+ drivers/input/misc/gpio_matrix.c | 406 ++++++++++++++++++++++++++++++++++++++
+ drivers/input/misc/gpio_output.c | 84 ++++++++
+ include/linux/gpio_event.h | 154 ++++++++++++++
+ 8 files changed, 1397 insertions(+), 0 deletions(-)
+ create mode 100644 drivers/input/misc/gpio_axis.c
+ create mode 100644 drivers/input/misc/gpio_event.c
+ create mode 100644 drivers/input/misc/gpio_input.c
+ create mode 100644 drivers/input/misc/gpio_matrix.c
+ create mode 100644 drivers/input/misc/gpio_output.c
+ create mode 100644 include/linux/gpio_event.h
+
+--- a/drivers/input/misc/Kconfig
++++ b/drivers/input/misc/Kconfig
+@@ -212,6 +212,11 @@ config INPUT_SGI_BTNS
+ To compile this driver as a module, choose M here: the
+ module will be called sgi_btns.
+
++config INPUT_GPIO
++ tristate "GPIO driver support"
++ help
++ Say Y here if you want to support gpio based keys, wheels etc...
++
+ config HP_SDC_RTC
+ tristate "HP SDC Real Time Clock"
+ depends on (GSC || HP300) && SERIO
+--- a/drivers/input/misc/Makefile
++++ b/drivers/input/misc/Makefile
+@@ -25,3 +25,5 @@ obj-$(CONFIG_INPUT_UINPUT) += uinput.o
+ obj-$(CONFIG_INPUT_WISTRON_BTNS) += wistron_btns.o
+ obj-$(CONFIG_INPUT_YEALINK) += yealink.o
+ obj-$(CONFIG_INPUT_GPIO_BUTTONS) += gpio_buttons.o
++obj-$(CONFIG_INPUT_GPIO) += gpio_event.o gpio_matrix.o gpio_input.o gpio_output.o gpio_axis.o
++
+--- /dev/null
++++ b/drivers/input/misc/gpio_axis.c
+@@ -0,0 +1,180 @@
++/* drivers/input/misc/gpio_axis.c
++ *
++ * Copyright (C) 2007 Google, Inc.
++ *
++ * This software is licensed under the terms of the GNU General Public
++ * License version 2, as published by the Free Software Foundation, and
++ * may be copied, distributed, and modified under those terms.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ */
++
++#include <linux/kernel.h>
++#include <linux/gpio.h>
++#include <linux/gpio_event.h>
++#include <linux/interrupt.h>
++
++struct gpio_axis_state {
++ struct input_dev *input_dev;
++ struct gpio_event_axis_info *info;
++ uint32_t pos;
++};
++
++uint16_t gpio_axis_4bit_gray_map_table[] = {
++ [0x0] = 0x0, [0x1] = 0x1, /* 0000 0001 */
++ [0x3] = 0x2, [0x2] = 0x3, /* 0011 0010 */
++ [0x6] = 0x4, [0x7] = 0x5, /* 0110 0111 */
++ [0x5] = 0x6, [0x4] = 0x7, /* 0101 0100 */
++ [0xc] = 0x8, [0xd] = 0x9, /* 1100 1101 */
++ [0xf] = 0xa, [0xe] = 0xb, /* 1111 1110 */
++ [0xa] = 0xc, [0xb] = 0xd, /* 1010 1011 */
++ [0x9] = 0xe, [0x8] = 0xf, /* 1001 1000 */
++};
++uint16_t gpio_axis_4bit_gray_map(struct gpio_event_axis_info *info, uint16_t in)
++{
++ return gpio_axis_4bit_gray_map_table[in];
++}
++
++uint16_t gpio_axis_5bit_singletrack_map_table[] = {
++ [0x10] = 0x00, [0x14] = 0x01, [0x1c] = 0x02, /* 10000 10100 11100 */
++ [0x1e] = 0x03, [0x1a] = 0x04, [0x18] = 0x05, /* 11110 11010 11000 */
++ [0x08] = 0x06, [0x0a] = 0x07, [0x0e] = 0x08, /* 01000 01010 01110 */
++ [0x0f] = 0x09, [0x0d] = 0x0a, [0x0c] = 0x0b, /* 01111 01101 01100 */
++ [0x04] = 0x0c, [0x05] = 0x0d, [0x07] = 0x0e, /* 00100 00101 00111 */
++ [0x17] = 0x0f, [0x16] = 0x10, [0x06] = 0x11, /* 10111 10110 00110 */
++ [0x02] = 0x12, [0x12] = 0x13, [0x13] = 0x14, /* 00010 10010 10011 */
++ [0x1b] = 0x15, [0x0b] = 0x16, [0x03] = 0x17, /* 11011 01011 00011 */
++ [0x01] = 0x18, [0x09] = 0x19, [0x19] = 0x1a, /* 00001 01001 11001 */
++ [0x1d] = 0x1b, [0x15] = 0x1c, [0x11] = 0x1d, /* 11101 10101 10001 */
++};
++uint16_t gpio_axis_5bit_singletrack_map(
++ struct gpio_event_axis_info *info, uint16_t in)
++{
++ return gpio_axis_5bit_singletrack_map_table[in];
++}
++
++static void gpio_event_update_axis(struct gpio_axis_state *as, int report)
++{
++ struct gpio_event_axis_info *ai = as->info;
++ int i;
++ int change;
++ uint16_t state = 0;
++ uint16_t pos;
++ uint16_t old_pos = as->pos;
++ for (i = ai->count - 1; i >= 0; i--)
++ state = (state << 1) | gpio_get_value(ai->gpio[i]);
++ pos = ai->map(ai, state);
++ if (ai->flags & GPIOEAF_PRINT_RAW)
++ pr_info("axis %d-%d raw %x, pos %d -> %d\n",
++ ai->type, ai->code, state, old_pos, pos);
++ if (report && pos != old_pos) {
++ if (ai->type == EV_REL) {
++ change = (ai->decoded_size + pos - old_pos) %
++ ai->decoded_size;
++ if (change > ai->decoded_size / 2)
++ change -= ai->decoded_size;
++ if (change == ai->decoded_size / 2) {
++ if (ai->flags & GPIOEAF_PRINT_EVENT)
++ pr_info("axis %d-%d unknown direction, "
++ "pos %d -> %d\n", ai->type,
++ ai->code, old_pos, pos);
++ change = 0; /* no closest direction */
++ }
++ if (ai->flags & GPIOEAF_PRINT_EVENT)
++ pr_info("axis %d-%d change %d\n",
++ ai->type, ai->code, change);
++ input_report_rel(as->input_dev, ai->code, change);
++ } else {
++ if (ai->flags & GPIOEAF_PRINT_EVENT)
++ pr_info("axis %d-%d now %d\n",
++ ai->type, ai->code, pos);
++ input_event(as->input_dev, ai->type, ai->code, pos);
++ }
++ input_sync(as->input_dev);
++ }
++ as->pos = pos;
++}
++
++static irqreturn_t gpio_axis_irq_handler(int irq, void *dev_id)
++{
++ struct gpio_axis_state *as = dev_id;
++ gpio_event_update_axis(as, 1);
++ return IRQ_HANDLED;
++}
++
++int gpio_event_axis_func(struct input_dev *input_dev,
++ struct gpio_event_info *info, void **data, int func)
++{
++ int ret;
++ int i;
++ int irq;
++ struct gpio_event_axis_info *ai;
++ struct gpio_axis_state *as;
++
++ ai = container_of(info, struct gpio_event_axis_info, info);
++ if (func == GPIO_EVENT_FUNC_SUSPEND) {
++ for (i = 0; i < ai->count; i++)
++ disable_irq(gpio_to_irq(ai->gpio[i]));
++ return 0;
++ }
++ if (func == GPIO_EVENT_FUNC_RESUME) {
++ for (i = 0; i < ai->count; i++)
++ enable_irq(gpio_to_irq(ai->gpio[i]));
++ return 0;
++ }
++
++ if (func == GPIO_EVENT_FUNC_INIT) {
++ *data = as = kmalloc(sizeof(*as), GFP_KERNEL);
++ if (as == NULL) {
++ ret = -ENOMEM;
++ goto err_alloc_axis_state_failed;
++ }
++ as->input_dev = input_dev;
++ as->info = ai;
++
++ input_set_capability(input_dev, ai->type, ai->code);
++ if (ai->type == EV_ABS) {
++ input_set_abs_params(input_dev, ai->code, 0,
++ ai->decoded_size - 1, 0, 0);
++ }
++ for (i = 0; i < ai->count; i++) {
++ ret = gpio_request(ai->gpio[i], "gpio_event_axis");
++ if (ret < 0)
++ goto err_request_gpio_failed;
++ ret = gpio_direction_input(ai->gpio[i]);
++ if (ret < 0)
++ goto err_gpio_direction_input_failed;
++ ret = irq = gpio_to_irq(ai->gpio[i]);
++ if (ret < 0)
++ goto err_get_irq_num_failed;
++ ret = request_irq(irq, gpio_axis_irq_handler,
++ IRQF_TRIGGER_RISING |
++ IRQF_TRIGGER_FALLING,
++ "gpio_event_axis", as);
++ if (ret < 0)
++ goto err_request_irq_failed;
++ }
++ gpio_event_update_axis(as, 0);
++ return 0;
++ }
++
++ ret = 0;
++ as = *data;
++ for (i = ai->count - 1; i >= 0; i--) {
++ free_irq(gpio_to_irq(ai->gpio[i]), as);
++err_request_irq_failed:
++err_get_irq_num_failed:
++err_gpio_direction_input_failed:
++ gpio_free(ai->gpio[i]);
++err_request_gpio_failed:
++ ;
++ }
++ kfree(as);
++ *data = NULL;
++err_alloc_axis_state_failed:
++ return ret;
++}
+--- /dev/null
++++ b/drivers/input/misc/gpio_event.c
+@@ -0,0 +1,224 @@
++/* drivers/input/misc/gpio_event.c
++ *
++ * Copyright (C) 2007 Google, Inc.
++ *
++ * This software is licensed under the terms of the GNU General Public
++ * License version 2, as published by the Free Software Foundation, and
++ * may be copied, distributed, and modified under those terms.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ */
++
++#include <linux/earlysuspend.h>
++#include <linux/module.h>
++#include <linux/input.h>
++#include <linux/gpio_event.h>
++#include <linux/hrtimer.h>
++#include <linux/platform_device.h>
++
++struct gpio_event {
++ struct input_dev *input_dev;
++ const struct gpio_event_platform_data *info;
++ struct early_suspend early_suspend;
++ void *state[0];
++};
++
++static int gpio_input_event(
++ struct input_dev *dev, unsigned int type, unsigned int code, int value)
++{
++ int i;
++ int ret = 0;
++ int tmp_ret;
++ struct gpio_event_info **ii;
++ struct gpio_event *ip = input_get_drvdata(dev);
++
++ for (i = 0, ii = ip->info->info; i < ip->info->info_count; i++, ii++) {
++ if ((*ii)->event) {
++ tmp_ret = (*ii)->event(ip->input_dev, *ii,
++ &ip->state[i], type, code, value);
++ if (tmp_ret)
++ ret = tmp_ret;
++ }
++ }
++ return ret;
++}
++
++static int gpio_event_call_all_func(struct gpio_event *ip, int func)
++{
++ int i;
++ int ret;
++ struct gpio_event_info **ii;
++
++ if (func == GPIO_EVENT_FUNC_INIT || func == GPIO_EVENT_FUNC_RESUME) {
++ ii = ip->info->info;
++ for (i = 0; i < ip->info->info_count; i++, ii++) {
++ if ((*ii)->func == NULL) {
++ ret = -ENODEV;
++ pr_err("gpio_event_probe: Incomplete pdata, "
++ "no function\n");
++ goto err_no_func;
++ }
++ ret = (*ii)->func(ip->input_dev, *ii, &ip->state[i],
++ func);
++ if (ret) {
++ pr_err("gpio_event_probe: function failed\n");
++ goto err_func_failed;
++ }
++ }
++ return 0;
++ }
++
++ ret = 0;
++ i = ip->info->info_count;
++ ii = ip->info->info + i;
++ while (i > 0) {
++ i--;
++ ii--;
++ (*ii)->func(ip->input_dev, *ii, &ip->state[i], func & ~1);
++err_func_failed:
++err_no_func:
++ ;
++ }
++ return ret;
++}
++
++#ifdef CONFIG_HAS_EARLYSUSPEND
++void gpio_event_suspend(struct early_suspend *h)
++{
++ struct gpio_event *ip;
++ ip = container_of(h, struct gpio_event, early_suspend);
++ gpio_event_call_all_func(ip, GPIO_EVENT_FUNC_SUSPEND);
++ ip->info->power(ip->info, 0);
++}
++
++void gpio_event_resume(struct early_suspend *h)
++{
++ struct gpio_event *ip;
++ ip = container_of(h, struct gpio_event, early_suspend);
++ ip->info->power(ip->info, 1);
++ gpio_event_call_all_func(ip, GPIO_EVENT_FUNC_RESUME);
++}
++#endif
++
++static int __init gpio_event_probe(struct platform_device *pdev)
++{
++ int err;
++ struct gpio_event *ip;
++ struct input_dev *input_dev;
++ struct gpio_event_platform_data *event_info;
++
++ event_info = pdev->dev.platform_data;
++ if (event_info == NULL) {
++ pr_err("gpio_event_probe: No pdata\n");
++ return -ENODEV;
++ }
++ if (event_info->name == NULL ||
++ event_info->info == NULL ||
++ event_info->info_count == 0) {
++ pr_err("gpio_event_probe: Incomplete pdata\n");
++ return -ENODEV;
++ }
++ ip = kzalloc(sizeof(*ip) +
++ sizeof(ip->state[0]) * event_info->info_count, GFP_KERNEL);
++ if (ip == NULL) {
++ err = -ENOMEM;
++ pr_err("gpio_event_probe: Failed to allocate private data\n");
++ goto err_kp_alloc_failed;
++ }
++ platform_set_drvdata(pdev, ip);
++
++ input_dev = input_allocate_device();
++ if (input_dev == NULL) {
++ err = -ENOMEM;
++ pr_err("gpio_event_probe: Failed to allocate input device\n");
++ goto err_input_dev_alloc_failed;
++ }
++ input_set_drvdata(input_dev, ip);
++ ip->input_dev = input_dev;
++ ip->info = event_info;
++ if (event_info->power) {
++#ifdef CONFIG_HAS_EARLYSUSPEND
++ ip->early_suspend.level = EARLY_SUSPEND_LEVEL_BLANK_SCREEN + 1;
++ ip->early_suspend.suspend = gpio_event_suspend;
++ ip->early_suspend.resume = gpio_event_resume;
++ register_early_suspend(&ip->early_suspend);
++#endif
++ ip->info->power(ip->info, 1);
++ }
++
++ input_dev->name = ip->info->name;
++ input_dev->event = gpio_input_event;
++
++ err = gpio_event_call_all_func(ip, GPIO_EVENT_FUNC_INIT);
++ if (err)
++ goto err_call_all_func_failed;
++
++ err = input_register_device(input_dev);
++ if (err) {
++ pr_err("gpio_event_probe: Unable to register %s input device\n",
++ input_dev->name);
++ goto err_input_register_device_failed;
++ }
++
++ return 0;
++
++err_input_register_device_failed:
++ gpio_event_call_all_func(ip, GPIO_EVENT_FUNC_UNINIT);
++err_call_all_func_failed:
++ if (event_info->power) {
++#ifdef CONFIG_HAS_EARLYSUSPEND
++ unregister_early_suspend(&ip->early_suspend);
++#endif
++ ip->info->power(ip->info, 0);
++ }
++ input_free_device(input_dev);
++err_input_dev_alloc_failed:
++ kfree(ip);
++err_kp_alloc_failed:
++ return err;
++}
++
++static int gpio_event_remove(struct platform_device *pdev)
++{
++ struct gpio_event *ip = platform_get_drvdata(pdev);
++
++ gpio_event_call_all_func(ip, GPIO_EVENT_FUNC_UNINIT);
++ if (ip->info->power) {
++#ifdef CONFIG_HAS_EARLYSUSPEND
++ unregister_early_suspend(&ip->early_suspend);
++#endif
++ ip->info->power(ip->info, 0);
++ }
++ input_unregister_device(ip->input_dev);
++ kfree(ip);
++ return 0;
++}
++
++static struct platform_driver gpio_event_driver = {
++ .probe = gpio_event_probe,
++ .remove = gpio_event_remove,
++ .driver = {
++ .name = GPIO_EVENT_DEV_NAME,
++ },
++};
++
++static int __devinit gpio_event_init(void)
++{
++ return platform_driver_register(&gpio_event_driver);
++}
++
++static void __exit gpio_event_exit(void)
++{
++ platform_driver_unregister(&gpio_event_driver);
++}
++
++module_init(gpio_event_init);
++module_exit(gpio_event_exit);
++
++MODULE_DESCRIPTION("GPIO Event Driver");
++MODULE_LICENSE("GPL");
++
+--- /dev/null
++++ b/drivers/input/misc/gpio_input.c
+@@ -0,0 +1,343 @@
++/* drivers/input/misc/gpio_input.c
++ *
++ * Copyright (C) 2007 Google, Inc.
++ *
++ * This software is licensed under the terms of the GNU General Public
++ * License version 2, as published by the Free Software Foundation, and
++ * may be copied, distributed, and modified under those terms.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ */
++
++#include <linux/kernel.h>
++#include <linux/gpio.h>
++#include <linux/gpio_event.h>
++#include <linux/hrtimer.h>
++#include <linux/input.h>
++#include <linux/interrupt.h>
++#include <linux/wakelock.h>
++
++enum {
++ DEBOUNCE_UNSTABLE = BIT(0), /* Got irq, while debouncing */
++ DEBOUNCE_PRESSED = BIT(1),
++ DEBOUNCE_NOTPRESSED = BIT(2),
++ DEBOUNCE_WAIT_IRQ = BIT(3), /* Stable irq state */
++ DEBOUNCE_POLL = BIT(4), /* Stable polling state */
++
++ DEBOUNCE_UNKNOWN =
++ DEBOUNCE_PRESSED | DEBOUNCE_NOTPRESSED,
++};
++
++struct gpio_key_state {
++ struct gpio_input_state *ds;
++ uint8_t debounce;
++};
++
++struct gpio_input_state {
++ struct input_dev *input_dev;
++ const struct gpio_event_input_info *info;
++ struct hrtimer timer;
++ int use_irq;
++ int debounce_count;
++ spinlock_t irq_lock;
++ struct wake_lock wake_lock;
++ struct gpio_key_state key_state[0];
++};
++
++static enum hrtimer_restart gpio_event_input_timer_func(struct hrtimer *timer)
++{
++ int i;
++ int pressed;
++ struct gpio_input_state *ds =
++ container_of(timer, struct gpio_input_state, timer);
++ unsigned gpio_flags = ds->info->flags;
++ unsigned npolarity;
++ int nkeys = ds->info->keymap_size;
++ const struct gpio_event_direct_entry *key_entry;
++ struct gpio_key_state *key_state;
++ unsigned long irqflags;
++ uint8_t debounce;
++
++#if 0
++ key_entry = kp->keys_info->keymap;
++ key_state = kp->key_state;
++ for (i = 0; i < nkeys; i++, key_entry++, key_state++)
++ pr_info("gpio_read_detect_status %d %d\n", key_entry->gpio,
++ gpio_read_detect_status(key_entry->gpio));
++#endif
++ key_entry = ds->info->keymap;
++ key_state = ds->key_state;
++ spin_lock_irqsave(&ds->irq_lock, irqflags);
++ for (i = 0; i < nkeys; i++, key_entry++, key_state++) {
++ debounce = key_state->debounce;
++ if (debounce & DEBOUNCE_WAIT_IRQ)
++ continue;
++ if (key_state->debounce & DEBOUNCE_UNSTABLE) {
++ debounce = key_state->debounce = DEBOUNCE_UNKNOWN;
++ enable_irq(gpio_to_irq(key_entry->gpio));
++ pr_info("gpio_keys_scan_keys: key %x-%x, %d "
++ "(%d) continue debounce\n",
++ ds->info->type, key_entry->code,
++ i, key_entry->gpio);
++ }
++ npolarity = !(gpio_flags & GPIOEDF_ACTIVE_HIGH);
++ pressed = gpio_get_value(key_entry->gpio) ^ npolarity;
++ if (debounce & DEBOUNCE_POLL) {
++ if (pressed == !(debounce & DEBOUNCE_PRESSED)) {
++ ds->debounce_count++;
++ key_state->debounce = DEBOUNCE_UNKNOWN;
++ if (gpio_flags & GPIOEDF_PRINT_KEY_DEBOUNCE)
++ pr_info("gpio_keys_scan_keys: key %x-"
++ "%x, %d (%d) start debounce\n",
++ ds->info->type, key_entry->code,
++ i, key_entry->gpio);
++ }
++ continue;
++ }
++ if (pressed && (debounce & DEBOUNCE_NOTPRESSED)) {
++ if (gpio_flags & GPIOEDF_PRINT_KEY_DEBOUNCE)
++ pr_info("gpio_keys_scan_keys: key %x-%x, %d "
++ "(%d) debounce pressed 1\n",
++ ds->info->type, key_entry->code,
++ i, key_entry->gpio);
++ key_state->debounce = DEBOUNCE_PRESSED;
++ continue;
++ }
++ if (!pressed && (debounce & DEBOUNCE_PRESSED)) {
++ if (gpio_flags & GPIOEDF_PRINT_KEY_DEBOUNCE)
++ pr_info("gpio_keys_scan_keys: key %x-%x, %d "
++ "(%d) debounce pressed 0\n",
++ ds->info->type, key_entry->code,
++ i, key_entry->gpio);
++ key_state->debounce = DEBOUNCE_NOTPRESSED;
++ continue;
++ }
++ /* key is stable */
++ ds->debounce_count--;
++ if (ds->use_irq)
++ key_state->debounce |= DEBOUNCE_WAIT_IRQ;
++ else
++ key_state->debounce |= DEBOUNCE_POLL;
++ if (gpio_flags & GPIOEDF_PRINT_KEYS)
++ pr_info("gpio_keys_scan_keys: key %x-%x, %d (%d) "
++ "changed to %d\n", ds->info->type,
++ key_entry->code, i, key_entry->gpio, pressed);
++ input_event(ds->input_dev, ds->info->type,
++ key_entry->code, pressed);
++ }
++
++#if 0
++ key_entry = kp->keys_info->keymap;
++ key_state = kp->key_state;
++ for (i = 0; i < nkeys; i++, key_entry++, key_state++) {
++ pr_info("gpio_read_detect_status %d %d\n", key_entry->gpio,
++ gpio_read_detect_status(key_entry->gpio));
++ }
++#endif
++
++ if (ds->debounce_count)
++ hrtimer_start(timer, ds->info->debounce_time, HRTIMER_MODE_REL);
++ else if (!ds->use_irq)
++ hrtimer_start(timer, ds->info->poll_time, HRTIMER_MODE_REL);
++ else
++ wake_unlock(&ds->wake_lock);
++
++ spin_unlock_irqrestore(&ds->irq_lock, irqflags);
++
++ return HRTIMER_NORESTART;
++}
++
++static irqreturn_t gpio_event_input_irq_handler(int irq, void *dev_id)
++{
++ struct gpio_key_state *ks = dev_id;
++ struct gpio_input_state *ds = ks->ds;
++ int keymap_index = ks - ds->key_state;
++ const struct gpio_event_direct_entry *key_entry;
++ unsigned long irqflags;
++ int pressed;
++
++ if (!ds->use_irq)
++ return IRQ_HANDLED;
++
++ key_entry = &ds->info->keymap[keymap_index];
++
++ if (ds->info->debounce_time.tv64) {
++ spin_lock_irqsave(&ds->irq_lock, irqflags);
++ if (ks->debounce & DEBOUNCE_WAIT_IRQ) {
++ ks->debounce = DEBOUNCE_UNKNOWN;
++ if (ds->debounce_count++ == 0) {
++ wake_lock(&ds->wake_lock);
++ hrtimer_start(
++ &ds->timer, ds->info->debounce_time,
++ HRTIMER_MODE_REL);
++ }
++ if (ds->info->flags & GPIOEDF_PRINT_KEY_DEBOUNCE)
++ pr_info("gpio_event_input_irq_handler: "
++ "key %x-%x, %d (%d) start debounce\n",
++ ds->info->type, key_entry->code,
++ keymap_index, key_entry->gpio);
++ } else {
++ disable_irq(irq);
++ ks->debounce = DEBOUNCE_UNSTABLE;
++ }
++ spin_unlock_irqrestore(&ds->irq_lock, irqflags);
++ } else {
++ pressed = gpio_get_value(key_entry->gpio) ^
++ !(ds->info->flags & GPIOEDF_ACTIVE_HIGH);
++ if (ds->info->flags & GPIOEDF_PRINT_KEYS)
++ pr_info("gpio_event_input_irq_handler: key %x-%x, %d "
++ "(%d) changed to %d\n",
++ ds->info->type, key_entry->code, keymap_index,
++ key_entry->gpio, pressed);
++ input_event(ds->input_dev, ds->info->type,
++ key_entry->code, pressed);
++ }
++ return IRQ_HANDLED;
++}
++
++static int gpio_event_input_request_irqs(struct gpio_input_state *ds)
++{
++ int i;
++ int err;
++ unsigned int irq;
++ unsigned long req_flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
++
++ for (i = 0; i < ds->info->keymap_size; i++) {
++ err = irq = gpio_to_irq(ds->info->keymap[i].gpio);
++ if (err < 0)
++ goto err_gpio_get_irq_num_failed;
++ err = request_irq(irq, gpio_event_input_irq_handler,
++ req_flags, "gpio_keys", &ds->key_state[i]);
++ if (err) {
++ pr_err("gpio_event_input_request_irqs: request_irq "
++ "failed for input %d, irq %d\n",
++ ds->info->keymap[i].gpio, irq);
++ goto err_request_irq_failed;
++ }
++ enable_irq_wake(irq);
++ }
++ return 0;
++
++ for (i = ds->info->keymap_size - 1; i >= 0; i--) {
++ free_irq(gpio_to_irq(ds->info->keymap[i].gpio),
++ &ds->key_state[i]);
++err_request_irq_failed:
++err_gpio_get_irq_num_failed:
++ ;
++ }
++ return err;
++}
++
++int gpio_event_input_func(struct input_dev *input_dev,
++ struct gpio_event_info *info, void **data, int func)
++{
++ int ret;
++ int i;
++ unsigned long irqflags;
++ struct gpio_event_input_info *di;
++ struct gpio_input_state *ds = *data;
++
++ di = container_of(info, struct gpio_event_input_info, info);
++
++ if (func == GPIO_EVENT_FUNC_SUSPEND) {
++ spin_lock_irqsave(&ds->irq_lock, irqflags);
++ if (ds->use_irq)
++ for (i = 0; i < di->keymap_size; i++)
++ disable_irq(gpio_to_irq(di->keymap[i].gpio));
++ spin_unlock_irqrestore(&ds->irq_lock, irqflags);
++ hrtimer_cancel(&ds->timer);
++ return 0;
++ }
++ if (func == GPIO_EVENT_FUNC_RESUME) {
++ spin_lock_irqsave(&ds->irq_lock, irqflags);
++ if (ds->use_irq)
++ for (i = 0; i < di->keymap_size; i++)
++ enable_irq(gpio_to_irq(di->keymap[i].gpio));
++ hrtimer_start(&ds->timer, ktime_set(0, 0), HRTIMER_MODE_REL);
++ spin_unlock_irqrestore(&ds->irq_lock, irqflags);
++ return 0;
++ }
++
++ if (func == GPIO_EVENT_FUNC_INIT) {
++ if (ktime_to_ns(di->poll_time) <= 0)
++ di->poll_time = ktime_set(0, 20 * NSEC_PER_MSEC);
++
++ *data = ds = kzalloc(sizeof(*ds) + sizeof(ds->key_state[0]) *
++ di->keymap_size, GFP_KERNEL);
++ if (ds == NULL) {
++ ret = -ENOMEM;
++ pr_err("gpio_event_input_func: "
++ "Failed to allocate private data\n");
++ goto err_ds_alloc_failed;
++ }
++ ds->debounce_count = di->keymap_size;
++ ds->input_dev = input_dev;
++ ds->info = di;
++ wake_lock_init(&ds->wake_lock, WAKE_LOCK_SUSPEND, "gpio_input");
++ spin_lock_init(&ds->irq_lock);
++
++ for (i = 0; i < di->keymap_size; i++) {
++ input_set_capability(input_dev, di->type,
++ di->keymap[i].code);
++ ds->key_state[i].ds = ds;
++ ds->key_state[i].debounce = DEBOUNCE_UNKNOWN;
++ }
++
++ for (i = 0; i < di->keymap_size; i++) {
++ ret = gpio_request(di->keymap[i].gpio, "gpio_kp_in");
++ if (ret) {
++ pr_err("gpio_event_input_func: gpio_request "
++ "failed for %d\n", di->keymap[i].gpio);
++ goto err_gpio_request_failed;
++ }
++ ret = gpio_direction_input(di->keymap[i].gpio);
++ if (ret) {
++ pr_err("gpio_event_input_func: "
++ "gpio_direction_input failed for %d\n",
++ di->keymap[i].gpio);
++ goto err_gpio_configure_failed;
++ }
++ }
++
++ ret = gpio_event_input_request_irqs(ds);
++
++ spin_lock_irqsave(&ds->irq_lock, irqflags);
++ ds->use_irq = ret == 0;
++
++ pr_info("GPIO Input Driver: Start gpio inputs for %s in %s "
++ "mode\n",
++ input_dev->name, ret == 0 ? "interrupt" : "polling");
++
++ hrtimer_init(&ds->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
++ ds->timer.function = gpio_event_input_timer_func;
++ hrtimer_start(&ds->timer, ktime_set(0, 0), HRTIMER_MODE_REL);
++ spin_unlock_irqrestore(&ds->irq_lock, irqflags);
++ return 0;
++ }
++
++ ret = 0;
++ spin_lock_irqsave(&ds->irq_lock, irqflags);
++ hrtimer_cancel(&ds->timer);
++ if (ds->use_irq) {
++ for (i = di->keymap_size - 1; i >= 0; i--) {
++ free_irq(gpio_to_irq(di->keymap[i].gpio),
++ &ds->key_state[i]);
++ }
++ }
++ spin_unlock_irqrestore(&ds->irq_lock, irqflags);
++
++ for (i = di->keymap_size - 1; i >= 0; i--) {
++err_gpio_configure_failed:
++ gpio_free(di->keymap[i].gpio);
++err_gpio_request_failed:
++ ;
++ }
++ wake_lock_destroy(&ds->wake_lock);
++ kfree(ds);
++err_ds_alloc_failed:
++ return ret;
++}
+--- /dev/null
++++ b/drivers/input/misc/gpio_matrix.c
+@@ -0,0 +1,406 @@
++/* drivers/input/misc/gpio_matrix.c
++ *
++ * Copyright (C) 2007 Google, Inc.
++ *
++ * This software is licensed under the terms of the GNU General Public
++ * License version 2, as published by the Free Software Foundation, and
++ * may be copied, distributed, and modified under those terms.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ */
++
++#include <linux/kernel.h>
++#include <linux/gpio.h>
++#include <linux/gpio_event.h>
++#include <linux/hrtimer.h>
++#include <linux/interrupt.h>
++#include <linux/wakelock.h>
++
++struct gpio_kp {
++ struct input_dev *input_dev;
++ struct gpio_event_matrix_info *keypad_info;
++ struct hrtimer timer;
++ struct wake_lock wake_lock;
++ int current_output;
++ unsigned int use_irq:1;
++ unsigned int key_state_changed:1;
++ unsigned int last_key_state_changed:1;
++ unsigned int some_keys_pressed:2;
++ unsigned long keys_pressed[0];
++};
++
++static void clear_phantom_key(struct gpio_kp *kp, int out, int in)
++{
++ struct gpio_event_matrix_info *mi = kp->keypad_info;
++ int key_index = out * mi->ninputs + in;
++ unsigned short keycode = mi->keymap[key_index];;
++
++ if (!test_bit(keycode, kp->input_dev->key)) {
++ if (mi->flags & GPIOKPF_PRINT_PHANTOM_KEYS)
++ pr_info("gpiomatrix: phantom key %x, %d-%d (%d-%d) "
++ "cleared\n", keycode, out, in,
++ mi->output_gpios[out], mi->input_gpios[in]);
++ __clear_bit(key_index, kp->keys_pressed);
++ } else {
++ if (mi->flags & GPIOKPF_PRINT_PHANTOM_KEYS)
++ pr_info("gpiomatrix: phantom key %x, %d-%d (%d-%d) "
++ "not cleared\n", keycode, out, in,
++ mi->output_gpios[out], mi->input_gpios[in]);
++ }
++}
++
++static int restore_keys_for_input(struct gpio_kp *kp, int out, int in)
++{
++ int rv = 0;
++ int key_index;
++
++ key_index = out * kp->keypad_info->ninputs + in;
++ while (out < kp->keypad_info->noutputs) {
++ if (test_bit(key_index, kp->keys_pressed)) {
++ rv = 1;
++ clear_phantom_key(kp, out, in);
++ }
++ key_index += kp->keypad_info->ninputs;
++ out++;
++ }
++ return rv;
++}
++
++static void remove_phantom_keys(struct gpio_kp *kp)
++{
++ int out, in, inp;
++ int key_index;
++
++ if (kp->some_keys_pressed < 3)
++ return;
++
++ for (out = 0; out < kp->keypad_info->noutputs; out++) {
++ inp = -1;
++ key_index = out * kp->keypad_info->ninputs;
++ for (in = 0; in < kp->keypad_info->ninputs; in++, key_index++) {
++ if (test_bit(key_index, kp->keys_pressed)) {
++ if (inp == -1) {
++ inp = in;
++ continue;
++ }
++ if (inp >= 0) {
++ if (!restore_keys_for_input(kp, out + 1,
++ inp))
++ break;
++ clear_phantom_key(kp, out, inp);
++ inp = -2;
++ }
++ restore_keys_for_input(kp, out, in);
++ }
++ }
++ }
++}
++
++static void report_key(struct gpio_kp *kp, int key_index, int out, int in)
++{
++ struct gpio_event_matrix_info *mi = kp->keypad_info;
++ int pressed = test_bit(key_index, kp->keys_pressed);
++ unsigned short keycode = mi->keymap[key_index];
++ if (pressed != test_bit(keycode, kp->input_dev->key)) {
++ if (keycode == KEY_RESERVED) {
++ if (mi->flags & GPIOKPF_PRINT_UNMAPPED_KEYS)
++ pr_info("gpiomatrix: unmapped key, %d-%d "
++ "(%d-%d) changed to %d\n",
++ out, in, mi->output_gpios[out],
++ mi->input_gpios[in], pressed);
++ } else {
++ if (mi->flags & GPIOKPF_PRINT_MAPPED_KEYS)
++ pr_info("gpiomatrix: key %x, %d-%d (%d-%d) "
++ "changed to %d\n", keycode,
++ out, in, mi->output_gpios[out],
++ mi->input_gpios[in], pressed);
++ input_report_key(kp->input_dev, keycode, pressed);
++ }
++ }
++}
++
++static enum hrtimer_restart gpio_keypad_timer_func(struct hrtimer *timer)
++{
++ int out, in;
++ int key_index;
++ int gpio;
++ struct gpio_kp *kp = container_of(timer, struct gpio_kp, timer);
++ struct gpio_event_matrix_info *mi = kp->keypad_info;
++ unsigned gpio_keypad_flags = mi->flags;
++ unsigned polarity = !!(gpio_keypad_flags & GPIOKPF_ACTIVE_HIGH);
++
++ out = kp->current_output;
++ if (out == mi->noutputs) {
++ out = 0;
++ kp->last_key_state_changed = kp->key_state_changed;
++ kp->key_state_changed = 0;
++ kp->some_keys_pressed = 0;
++ } else {
++ key_index = out * mi->ninputs;
++ for (in = 0; in < mi->ninputs; in++, key_index++) {
++ gpio = mi->input_gpios[in];
++ if (gpio_get_value(gpio) ^ !polarity) {
++ if (kp->some_keys_pressed < 3)
++ kp->some_keys_pressed++;
++ kp->key_state_changed |= !__test_and_set_bit(
++ key_index, kp->keys_pressed);
++ } else
++ kp->key_state_changed |= __test_and_clear_bit(
++ key_index, kp->keys_pressed);
++ }
++ gpio = mi->output_gpios[out];
++ if (gpio_keypad_flags & GPIOKPF_DRIVE_INACTIVE)
++ gpio_set_value(gpio, !polarity);
++ else
++ gpio_direction_input(gpio);
++ out++;
++ }
++ kp->current_output = out;
++ if (out < mi->noutputs) {
++ gpio = mi->output_gpios[out];
++ if (gpio_keypad_flags & GPIOKPF_DRIVE_INACTIVE)
++ gpio_set_value(gpio, polarity);
++ else
++ gpio_direction_output(gpio, polarity);
++ hrtimer_start(timer, mi->settle_time, HRTIMER_MODE_REL);
++ return HRTIMER_NORESTART;
++ }
++ if (gpio_keypad_flags & GPIOKPF_DEBOUNCE) {
++ if (kp->key_state_changed) {
++ hrtimer_start(&kp->timer, mi->debounce_delay,
++ HRTIMER_MODE_REL);
++ return HRTIMER_NORESTART;
++ }
++ kp->key_state_changed = kp->last_key_state_changed;
++ }
++ if (kp->key_state_changed) {
++ if (gpio_keypad_flags & GPIOKPF_REMOVE_SOME_PHANTOM_KEYS)
++ remove_phantom_keys(kp);
++ key_index = 0;
++ for (out = 0; out < mi->noutputs; out++)
++ for (in = 0; in < mi->ninputs; in++, key_index++)
++ report_key(kp, key_index, out, in);
++ }
++ if (!kp->use_irq || kp->some_keys_pressed) {
++ hrtimer_start(timer, mi->poll_time, HRTIMER_MODE_REL);
++ return HRTIMER_NORESTART;
++ }
++
++ /* No keys are pressed, reenable interrupt */
++ for (out = 0; out < mi->noutputs; out++) {
++ if (gpio_keypad_flags & GPIOKPF_DRIVE_INACTIVE)
++ gpio_set_value(mi->output_gpios[out], polarity);
++ else
++ gpio_direction_output(mi->output_gpios[out], polarity);
++ }
++ for (in = 0; in < mi->ninputs; in++)
++ enable_irq(gpio_to_irq(mi->input_gpios[in]));
++ wake_unlock(&kp->wake_lock);
++ return HRTIMER_NORESTART;
++}
++
++static irqreturn_t gpio_keypad_irq_handler(int irq_in, void *dev_id)
++{
++ int i;
++ struct gpio_kp *kp = dev_id;
++ struct gpio_event_matrix_info *mi = kp->keypad_info;
++ unsigned gpio_keypad_flags = mi->flags;
++
++ if (!kp->use_irq) /* ignore interrupt while registering the handler */
++ return IRQ_HANDLED;
++
++ for (i = 0; i < mi->ninputs; i++)
++ disable_irq(gpio_to_irq(mi->input_gpios[i]));
++ for (i = 0; i < mi->noutputs; i++) {
++ if (gpio_keypad_flags & GPIOKPF_DRIVE_INACTIVE)
++ gpio_set_value(mi->output_gpios[i],
++ !(gpio_keypad_flags & GPIOKPF_ACTIVE_HIGH));
++ else
++ gpio_direction_input(mi->output_gpios[i]);
++ }
++ wake_lock(&kp->wake_lock);
++ hrtimer_start(&kp->timer, ktime_set(0, 0), HRTIMER_MODE_REL);
++ return IRQ_HANDLED;
++}
++
++static int gpio_keypad_request_irqs(struct gpio_kp *kp)
++{
++ int i;
++ int err;
++ unsigned int irq;
++ unsigned long request_flags;
++ struct gpio_event_matrix_info *mi = kp->keypad_info;
++
++ switch (mi->flags & (GPIOKPF_ACTIVE_HIGH|GPIOKPF_LEVEL_TRIGGERED_IRQ)) {
++ default:
++ request_flags = IRQF_TRIGGER_FALLING;
++ break;
++ case GPIOKPF_ACTIVE_HIGH:
++ request_flags = IRQF_TRIGGER_RISING;
++ break;
++ case GPIOKPF_LEVEL_TRIGGERED_IRQ:
++ request_flags = IRQF_TRIGGER_LOW;
++ break;
++ case GPIOKPF_LEVEL_TRIGGERED_IRQ | GPIOKPF_ACTIVE_HIGH:
++ request_flags = IRQF_TRIGGER_HIGH;
++ break;
++ }
++
++ for (i = 0; i < mi->ninputs; i++) {
++ err = irq = gpio_to_irq(mi->input_gpios[i]);
++ if (err < 0)
++ goto err_gpio_get_irq_num_failed;
++ err = request_irq(irq, gpio_keypad_irq_handler, request_flags,
++ "gpio_kp", kp);
++ if (err) {
++ pr_err("gpiomatrix: request_irq failed for input %d, "
++ "irq %d\n", mi->input_gpios[i], irq);
++ goto err_request_irq_failed;
++ }
++ err = set_irq_wake(irq, 1);
++ if (err) {
++ pr_err("gpiomatrix: set_irq_wake failed for input %d, "
++ "irq %d\n", mi->input_gpios[i], irq);
++ }
++ disable_irq(irq);
++ }
++ return 0;
++
++ for (i = mi->noutputs - 1; i >= 0; i--) {
++ free_irq(gpio_to_irq(mi->input_gpios[i]), kp);
++err_request_irq_failed:
++err_gpio_get_irq_num_failed:
++ ;
++ }
++ return err;
++}
++
++int gpio_event_matrix_func(struct input_dev *input_dev,
++ struct gpio_event_info *info, void **data, int func)
++{
++ int i;
++ int err;
++ int key_count;
++ struct gpio_kp *kp;
++ struct gpio_event_matrix_info *mi;
++
++ mi = container_of(info, struct gpio_event_matrix_info, info);
++ if (func == GPIO_EVENT_FUNC_SUSPEND || func == GPIO_EVENT_FUNC_RESUME) {
++ /* TODO: disable scanning */
++ return 0;
++ }
++
++ if (func == GPIO_EVENT_FUNC_INIT) {
++ if (mi->keymap == NULL ||
++ mi->input_gpios == NULL ||
++ mi->output_gpios == NULL) {
++ err = -ENODEV;
++ pr_err("gpiomatrix: Incomplete pdata\n");
++ goto err_invalid_platform_data;
++ }
++ key_count = mi->ninputs * mi->noutputs;
++
++ *data = kp = kzalloc(sizeof(*kp) + sizeof(kp->keys_pressed[0]) *
++ BITS_TO_LONGS(key_count), GFP_KERNEL);
++ if (kp == NULL) {
++ err = -ENOMEM;
++ pr_err("gpiomatrix: Failed to allocate private data\n");
++ goto err_kp_alloc_failed;
++ }
++ kp->input_dev = input_dev;
++ kp->keypad_info = mi;
++ set_bit(EV_KEY, input_dev->evbit);
++ for (i = 0; i < key_count; i++) {
++ if (mi->keymap[i])
++ set_bit(mi->keymap[i] & KEY_MAX,
++ input_dev->keybit);
++ }
++
++ for (i = 0; i < mi->noutputs; i++) {
++ if (gpio_cansleep(mi->output_gpios[i])) {
++ pr_err("gpiomatrix: unsupported output gpio %d,"
++ " can sleep\n", mi->output_gpios[i]);
++ err = -EINVAL;
++ goto err_request_output_gpio_failed;
++ }
++ err = gpio_request(mi->output_gpios[i], "gpio_kp_out");
++ if (err) {
++ pr_err("gpiomatrix: gpio_request failed for "
++ "output %d\n", mi->output_gpios[i]);
++ goto err_request_output_gpio_failed;
++ }
++ if (mi->flags & GPIOKPF_DRIVE_INACTIVE)
++ err = gpio_direction_output(mi->output_gpios[i],
++ !(mi->flags & GPIOKPF_ACTIVE_HIGH));
++ else
++ err = gpio_direction_input(mi->output_gpios[i]);
++ if (err) {
++ pr_err("gpiomatrix: gpio_configure failed for "
++ "output %d\n", mi->output_gpios[i]);
++ goto err_output_gpio_configure_failed;
++ }
++ }
++ for (i = 0; i < mi->ninputs; i++) {
++ err = gpio_request(mi->input_gpios[i], "gpio_kp_in");
++ if (err) {
++ pr_err("gpiomatrix: gpio_request failed for "
++ "input %d\n", mi->input_gpios[i]);
++ goto err_request_input_gpio_failed;
++ }
++ err = gpio_direction_input(mi->input_gpios[i]);
++ if (err) {
++ pr_err("gpiomatrix: gpio_direction_input failed"
++ " for input %d\n", mi->input_gpios[i]);
++ goto err_gpio_direction_input_failed;
++ }
++ }
++ kp->current_output = mi->noutputs;
++ kp->key_state_changed = 1;
++
++ hrtimer_init(&kp->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
++ kp->timer.function = gpio_keypad_timer_func;
++ wake_lock_init(&kp->wake_lock, WAKE_LOCK_SUSPEND, "gpio_kp");
++ err = gpio_keypad_request_irqs(kp);
++ kp->use_irq = err == 0;
++
++ pr_info("GPIO Matrix Keypad Driver: Start keypad matrix for %s "
++ "in %s mode\n", input_dev->name,
++ kp->use_irq ? "interrupt" : "polling");
++
++ if (kp->use_irq)
++ wake_lock(&kp->wake_lock);
++ hrtimer_start(&kp->timer, ktime_set(0, 0), HRTIMER_MODE_REL);
++
++ return 0;
++ }
++
++ err = 0;
++ kp = *data;
++
++ if (kp->use_irq)
++ for (i = mi->noutputs - 1; i >= 0; i--)
++ free_irq(gpio_to_irq(mi->input_gpios[i]), kp);
++
++ hrtimer_cancel(&kp->timer);
++ wake_lock_destroy(&kp->wake_lock);
++ for (i = mi->noutputs - 1; i >= 0; i--) {
++err_gpio_direction_input_failed:
++ gpio_free(mi->input_gpios[i]);
++err_request_input_gpio_failed:
++ ;
++ }
++ for (i = mi->noutputs - 1; i >= 0; i--) {
++err_output_gpio_configure_failed:
++ gpio_free(mi->output_gpios[i]);
++err_request_output_gpio_failed:
++ ;
++ }
++ kfree(kp);
++err_kp_alloc_failed:
++err_invalid_platform_data:
++ return err;
++}
+--- /dev/null
++++ b/drivers/input/misc/gpio_output.c
+@@ -0,0 +1,84 @@
++/* drivers/input/misc/gpio_output.c
++ *
++ * Copyright (C) 2007 Google, Inc.
++ *
++ * This software is licensed under the terms of the GNU General Public
++ * License version 2, as published by the Free Software Foundation, and
++ * may be copied, distributed, and modified under those terms.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ */
++
++#include <linux/kernel.h>
++#include <linux/gpio.h>
++#include <linux/gpio_event.h>
++
++int gpio_event_output_event(
++ struct input_dev *input_dev, struct gpio_event_info *info, void **data,
++ unsigned int type, unsigned int code, int value)
++{
++ int i;
++ struct gpio_event_output_info *oi;
++ oi = container_of(info, struct gpio_event_output_info, info);
++ if (type != oi->type)
++ return 0;
++ if (!(oi->flags & GPIOEDF_ACTIVE_HIGH))
++ value = !value;
++ for (i = 0; i < oi->keymap_size; i++)
++ if (code == oi->keymap[i].code)
++ gpio_set_value(oi->keymap[i].gpio, value);
++ return 0;
++}
++
++int gpio_event_output_func(
++ struct input_dev *input_dev, struct gpio_event_info *info, void **data,
++ int func)
++{
++ int ret;
++ int i;
++ struct gpio_event_output_info *oi;
++ oi = container_of(info, struct gpio_event_output_info, info);
++
++ if (func == GPIO_EVENT_FUNC_SUSPEND || func == GPIO_EVENT_FUNC_RESUME)
++ return 0;
++
++ if (func == GPIO_EVENT_FUNC_INIT) {
++ int output_level = !(oi->flags & GPIOEDF_ACTIVE_HIGH);
++ for (i = 0; i < oi->keymap_size; i++)
++ input_set_capability(input_dev, oi->type,
++ oi->keymap[i].code);
++
++ for (i = 0; i < oi->keymap_size; i++) {
++ ret = gpio_request(oi->keymap[i].gpio,
++ "gpio_event_output");
++ if (ret) {
++ pr_err("gpio_event_output_func: gpio_request "
++ "failed for %d\n", oi->keymap[i].gpio);
++ goto err_gpio_request_failed;
++ }
++ ret = gpio_direction_output(oi->keymap[i].gpio,
++ output_level);
++ if (ret) {
++ pr_err("gpio_event_output_func: "
++ "gpio_direction_output failed for %d\n",
++ oi->keymap[i].gpio);
++ goto err_gpio_direction_output_failed;
++ }
++ }
++ return 0;
++ }
++
++ ret = 0;
++ for (i = oi->keymap_size - 1; i >= 0; i--) {
++err_gpio_direction_output_failed:
++ gpio_free(oi->keymap[i].gpio);
++err_gpio_request_failed:
++ ;
++ }
++ return ret;
++}
++
+--- /dev/null
++++ b/include/linux/gpio_event.h
+@@ -0,0 +1,154 @@
++/* include/linux/gpio_event.h
++ *
++ * Copyright (C) 2007 Google, Inc.
++ *
++ * This software is licensed under the terms of the GNU General Public
++ * License version 2, as published by the Free Software Foundation, and
++ * may be copied, distributed, and modified under those terms.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ */
++
++#ifndef _LINUX_GPIO_EVENT_H
++#define _LINUX_GPIO_EVENT_H
++
++#include <linux/input.h>
++
++enum {
++ GPIO_EVENT_FUNC_UNINIT = 0x0,
++ GPIO_EVENT_FUNC_INIT = 0x1,
++ GPIO_EVENT_FUNC_SUSPEND = 0x2,
++ GPIO_EVENT_FUNC_RESUME = 0x3,
++};
++struct gpio_event_info {
++ int (*func)(struct input_dev *input_dev,
++ struct gpio_event_info *info,
++ void **data, int func);
++ int (*event)(struct input_dev *input_dev,
++ struct gpio_event_info *info,
++ void **data, unsigned int type,
++ unsigned int code, int value); /* out events */
++};
++
++struct gpio_event_platform_data {
++ const char *name;
++ struct gpio_event_info **info;
++ size_t info_count;
++ int (*power)(const struct gpio_event_platform_data *pdata, bool on);
++};
++
++#define GPIO_EVENT_DEV_NAME "gpio-event"
++
++/* Key matrix */
++
++enum gpio_event_matrix_flags {
++ /* unset: drive active output low, set: drive active output high */
++ GPIOKPF_ACTIVE_HIGH = 1U << 0,
++ GPIOKPF_DEBOUNCE = 1U << 1,
++ GPIOKPF_REMOVE_SOME_PHANTOM_KEYS = 1U << 2,
++ GPIOKPF_REMOVE_PHANTOM_KEYS = GPIOKPF_REMOVE_SOME_PHANTOM_KEYS |
++ GPIOKPF_DEBOUNCE,
++ GPIOKPF_DRIVE_INACTIVE = 1U << 3,
++ GPIOKPF_LEVEL_TRIGGERED_IRQ = 1U << 4,
++ GPIOKPF_PRINT_UNMAPPED_KEYS = 1U << 16,
++ GPIOKPF_PRINT_MAPPED_KEYS = 1U << 17,
++ GPIOKPF_PRINT_PHANTOM_KEYS = 1U << 18,
++};
++
++extern int gpio_event_matrix_func(struct input_dev *input_dev,
++ struct gpio_event_info *info, void **data, int func);
++struct gpio_event_matrix_info {
++ /* initialize to gpio_event_matrix_func */
++ struct gpio_event_info info;
++ /* size must be ninputs * noutputs */
++ const unsigned short *keymap;
++ unsigned int *input_gpios;
++ unsigned int *output_gpios;
++ unsigned int ninputs;
++ unsigned int noutputs;
++ /* time to wait before reading inputs after driving each output */
++ ktime_t settle_time;
++ /* time to wait before scanning the keypad a second time */
++ ktime_t debounce_delay;
++ ktime_t poll_time;
++ unsigned flags;
++};
++
++/* Directly connected inputs and outputs */
++
++enum gpio_event_direct_flags {
++ GPIOEDF_ACTIVE_HIGH = 1U << 0,
++/* GPIOEDF_USE_DOWN_IRQ = 1U << 1, */
++/* GPIOEDF_USE_IRQ = (1U << 2) | GPIOIDF_USE_DOWN_IRQ, */
++ GPIOEDF_PRINT_KEYS = 1U << 8,
++ GPIOEDF_PRINT_KEY_DEBOUNCE = 1U << 9,
++};
++
++struct gpio_event_direct_entry {
++ uint32_t gpio:23;
++ uint32_t code:9;
++};
++
++/* inputs */
++extern int gpio_event_input_func(struct input_dev *input_dev,
++ struct gpio_event_info *info, void **data, int func);
++struct gpio_event_input_info {
++ /* initialize to gpio_event_input_func */
++ struct gpio_event_info info;
++ ktime_t debounce_time;
++ ktime_t poll_time;
++ uint16_t flags;
++ uint16_t type;
++ const struct gpio_event_direct_entry *keymap;
++ size_t keymap_size;
++};
++
++/* outputs */
++extern int gpio_event_output_func(struct input_dev *input_dev,
++ struct gpio_event_info *info, void **data, int func);
++extern int gpio_event_output_event(struct input_dev *input_dev,
++ struct gpio_event_info *info, void **data,
++ unsigned int type, unsigned int code, int value);
++struct gpio_event_output_info {
++ /* initialize to gpio_event_output_func and gpio_event_output_event */
++ struct gpio_event_info info;
++ uint16_t flags;
++ uint16_t type;
++ const struct gpio_event_direct_entry *keymap;
++ size_t keymap_size;
++};
++
++
++/* axes */
++
++enum gpio_event_axis_flags {
++ GPIOEAF_PRINT_UNKNOWN_DIRECTION = 1U << 16,
++ GPIOEAF_PRINT_RAW = 1U << 17,
++ GPIOEAF_PRINT_EVENT = 1U << 18,
++};
++
++extern int gpio_event_axis_func(struct input_dev *input_dev,
++ struct gpio_event_info *info, void **data, int func);
++struct gpio_event_axis_info {
++ /* initialize to gpio_event_axis_func */
++ struct gpio_event_info info;
++ uint8_t count;
++ uint8_t type; /* EV_REL or EV_ABS */
++ uint16_t code;
++ uint16_t decoded_size;
++ uint16_t (*map)(struct gpio_event_axis_info *info, uint16_t in);
++ uint32_t *gpio;
++ uint32_t flags;
++};
++#define gpio_axis_2bit_gray_map gpio_axis_4bit_gray_map
++#define gpio_axis_3bit_gray_map gpio_axis_4bit_gray_map
++uint16_t gpio_axis_4bit_gray_map(
++ struct gpio_event_axis_info *info, uint16_t in);
++uint16_t gpio_axis_5bit_singletrack_map(
++ struct gpio_event_axis_info *info, uint16_t in);
++
++#endif