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ANDROID: input: Generic GPIO Input devices

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Supports keyboard matrixces, direct inputs, direct outputs and axes connected to gpios.

Change-Id: I5e921e6e3a1cc169316ee3b665f4cc21b5735114
Signed-off-by: Arve Hjønnevåg <arve@android.com>
Signed-off-by: Nick Pelly <npelly@google.com>

[AmitP: Use ktime directly to align with upstream commit
        2456e85535 ("ktime: Get rid of the union")]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
This commit is contained in:
Arve Hjønnevåg 2008-10-15 18:23:47 -07:00 • committed by Amit Pundir
parent 28cf0129a3
commit 09141d311b
8 changed files with 1531 additions and 0 deletions

5
drivers/input/misc/Kconfig
View file

@ -521,6 +521,11 @@ 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

1
drivers/input/misc/Makefile
View file

@ -36,6 +36,7 @@ obj-$(CONFIG_INPUT_DRV2667_HAPTICS) += drv2667.o
obj-$(CONFIG_INPUT_GP2A) += gp2ap002a00f.o
obj-$(CONFIG_INPUT_GPIO_BEEPER) += gpio-beeper.o
obj-$(CONFIG_INPUT_GPIO_DECODER) += gpio_decoder.o
obj-$(CONFIG_INPUT_GPIO) += gpio_event.o gpio_matrix.o gpio_input.o gpio_output.o gpio_axis.o
obj-$(CONFIG_INPUT_HISI_POWERKEY) += hisi_powerkey.o
obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o
obj-$(CONFIG_INPUT_IMS_PCU) += ims-pcu.o

192
drivers/input/misc/gpio_axis.c Normal file
View file

@ -0,0 +1,192 @@
/* 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>
#include <linux/slab.h>
struct gpio_axis_state {
struct gpio_event_input_devs *input_devs;
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_devs->dev[ai->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_devs->dev[ai->dev],
ai->type, ai->code, pos);
}
input_sync(as->input_devs->dev[ai->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 gpio_event_input_devs *input_devs,
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_devs = input_devs;
as->info = ai;
if (ai->dev >= input_devs->count) {
pr_err("gpio_event_axis: bad device index %d >= %d "
"for %d:%d\n", ai->dev, input_devs->count,
ai->type, ai->code);
ret = -EINVAL;
goto err_bad_device_index;
}
input_set_capability(input_devs->dev[ai->dev],
ai->type, ai->code);
if (ai->type == EV_ABS) {
input_set_abs_params(input_devs->dev[ai->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:
;
}
err_bad_device_index:
kfree(as);
*data = NULL;
err_alloc_axis_state_failed:
return ret;
}

249
drivers/input/misc/gpio_event.c Normal file
View file

@ -0,0 +1,249 @@
/* 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>
#include <linux/slab.h>
struct gpio_event {
struct gpio_event_input_devs *input_devs;
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 devnr;
int ret = 0;
int tmp_ret;
struct gpio_event_info **ii;
struct gpio_event *ip = input_get_drvdata(dev);
for (devnr = 0; devnr < ip->input_devs->count; devnr++)
if (ip->input_devs->dev[devnr] == dev)
break;
if (devnr == ip->input_devs->count) {
pr_err("gpio_input_event: unknown device %p\n", dev);
return -EIO;
}
for (i = 0, ii = ip->info->info; i < ip->info->info_count; i++, ii++) {
if ((*ii)->event) {
tmp_ret = (*ii)->event(ip->input_devs, *ii,
&ip->state[i],
devnr, 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;
}
if (func == GPIO_EVENT_FUNC_RESUME && (*ii)->no_suspend)
continue;
ret = (*ii)->func(ip->input_devs, *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--;
if ((func & ~1) == GPIO_EVENT_FUNC_SUSPEND && (*ii)->no_suspend)
continue;
(*ii)->func(ip->input_devs, *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 gpio_event_probe(struct platform_device *pdev)
{
int err;
struct gpio_event *ip;
struct gpio_event_platform_data *event_info;
int dev_count = 1;
int i;
int registered = 0;
event_info = pdev->dev.platform_data;
if (event_info == NULL) {
pr_err("gpio_event_probe: No pdata\n");
return -ENODEV;
}
if ((!event_info->name && !event_info->names[0]) ||
!event_info->info || !event_info->info_count) {
pr_err("gpio_event_probe: Incomplete pdata\n");
return -ENODEV;
}
if (!event_info->name)
while (event_info->names[dev_count])
dev_count++;
ip = kzalloc(sizeof(*ip) +
sizeof(ip->state[0]) * event_info->info_count +
sizeof(*ip->input_devs) +
sizeof(ip->input_devs->dev[0]) * dev_count, GFP_KERNEL);
if (ip == NULL) {
err = -ENOMEM;
pr_err("gpio_event_probe: Failed to allocate private data\n");
goto err_kp_alloc_failed;
}
ip->input_devs = (void*)&ip->state[event_info->info_count];
platform_set_drvdata(pdev, ip);
for (i = 0; i < dev_count; i++) {
struct input_dev *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);
input_dev->name = event_info->name ?
event_info->name : event_info->names[i];
input_dev->event = gpio_input_event;
ip->input_devs->dev[i] = input_dev;
}
ip->input_devs->count = dev_count;
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);
}
err = gpio_event_call_all_func(ip, GPIO_EVENT_FUNC_INIT);
if (err)
goto err_call_all_func_failed;
for (i = 0; i < dev_count; i++) {
err = input_register_device(ip->input_devs->dev[i]);
if (err) {
pr_err("gpio_event_probe: Unable to register %s "
"input device\n", ip->input_devs->dev[i]->name);
goto err_input_register_device_failed;
}
registered++;
}
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);
}
for (i = 0; i < registered; i++)
input_unregister_device(ip->input_devs->dev[i]);
for (i = dev_count - 1; i >= registered; i--) {
input_free_device(ip->input_devs->dev[i]);
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);
int i;
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);
}
for (i = 0; i < ip->input_devs->count; i++)
input_unregister_device(ip->input_devs->dev[i]);
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,
},
};
module_platform_driver(gpio_event_driver);
MODULE_DESCRIPTION("GPIO Event Driver");
MODULE_LICENSE("GPL");

376
drivers/input/misc/gpio_input.c Normal file
View file

@ -0,0 +1,376 @@
/* 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/slab.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 gpio_event_input_devs *input_devs;
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;
bool sync_needed;
#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;
sync_needed = false;
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));
if (gpio_flags & GPIOEDF_PRINT_KEY_UNSTABLE)
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_devs->dev[key_entry->dev], ds->info->type,
key_entry->code, pressed);
sync_needed = true;
}
if (sync_needed) {
for (i = 0; i < ds->input_devs->count; i++)
input_sync(ds->input_devs->dev[i]);
}
#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) {
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_nosync(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_devs->dev[key_entry->dev], ds->info->type,
key_entry->code, pressed);
input_sync(ds->input_devs->dev[key_entry->dev]);
}
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;
}
if (ds->info->info.no_suspend) {
err = enable_irq_wake(irq);
if (err) {
pr_err("gpio_event_input_request_irqs: "
"enable_irq_wake failed for input %d, "
"irq %d\n",
ds->info->keymap[i].gpio, irq);
goto err_enable_irq_wake_failed;
}
}
}
return 0;
for (i = ds->info->keymap_size - 1; i >= 0; i--) {
irq = gpio_to_irq(ds->info->keymap[i].gpio);
if (ds->info->info.no_suspend)
disable_irq_wake(irq);
err_enable_irq_wake_failed:
free_irq(irq, &ds->key_state[i]);
err_request_irq_failed:
err_gpio_get_irq_num_failed:
;
}
return err;
}
int gpio_event_input_func(struct gpio_event_input_devs *input_devs,
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) {
if (ds->use_irq)
for (i = 0; i < di->keymap_size; i++)
disable_irq(gpio_to_irq(di->keymap[i].gpio));
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_devs = input_devs;
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++) {
int dev = di->keymap[i].dev;
if (dev >= input_devs->count) {
pr_err("gpio_event_input_func: bad device "
"index %d >= %d for key code %d\n",
dev, input_devs->count,
di->keymap[i].code);
ret = -EINVAL;
goto err_bad_keymap;
}
input_set_capability(input_devs->dev[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%s in %s "
"mode\n", input_devs->dev[0]->name,
(input_devs->count > 1) ? "..." : "",
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--) {
int irq = gpio_to_irq(di->keymap[i].gpio);
if (ds->info->info.no_suspend)
disable_irq_wake(irq);
free_irq(irq, &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:
;
}
err_bad_keymap:
wake_lock_destroy(&ds->wake_lock);
kfree(ds);
err_ds_alloc_failed:
return ret;
}

441
drivers/input/misc/gpio_matrix.c Normal file
View file

@ -0,0 +1,441 @@
/* 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/slab.h>
#include <linux/wakelock.h>
struct gpio_kp {
struct gpio_event_input_devs *input_devs;
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 int disabled_irq:1;
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 keyentry = mi->keymap[key_index];
unsigned short keycode = keyentry & MATRIX_KEY_MASK;
unsigned short dev = keyentry >> MATRIX_CODE_BITS;
if (!test_bit(keycode, kp->input_devs->dev[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 keyentry = mi->keymap[key_index];
unsigned short keycode = keyentry & MATRIX_KEY_MASK;
unsigned short dev = keyentry >> MATRIX_CODE_BITS;
if (pressed != test_bit(keycode, kp->input_devs->dev[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_devs->dev[dev], keycode, pressed);
}
}
}
static void report_sync(struct gpio_kp *kp)
{
int i;
for (i = 0; i < kp->input_devs->count; i++)
input_sync(kp->input_devs->dev[i]);
}
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);
report_sync(kp);
}
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 */
kp->disabled_irq = 1;
disable_irq_nosync(irq_in);
return IRQ_HANDLED;
}
for (i = 0; i < mi->ninputs; i++)
disable_irq_nosync(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 = enable_irq_wake(irq);
if (err) {
pr_err("gpiomatrix: set_irq_wake failed for input %d, "
"irq %d\n", mi->input_gpios[i], irq);
}
disable_irq(irq);
if (kp->disabled_irq) {
kp->disabled_irq = 0;
enable_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 gpio_event_input_devs *input_devs,
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_devs = input_devs;
kp->keypad_info = mi;
for (i = 0; i < key_count; i++) {
unsigned short keyentry = mi->keymap[i];
unsigned short keycode = keyentry & MATRIX_KEY_MASK;
unsigned short dev = keyentry >> MATRIX_CODE_BITS;
if (dev >= input_devs->count) {
pr_err("gpiomatrix: bad device index %d >= "
"%d for key code %d\n",
dev, input_devs->count, keycode);
err = -EINVAL;
goto err_bad_keymap;
}
if (keycode && keycode <= KEY_MAX)
input_set_capability(input_devs->dev[dev],
EV_KEY, keycode);
}
for (i = 0; i < mi->noutputs; i++) {
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 (gpio_cansleep(mi->output_gpios[i])) {
pr_err("gpiomatrix: unsupported output gpio %d,"
" can sleep\n", mi->output_gpios[i]);
err = -EINVAL;
goto err_output_gpio_configure_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%s in %s mode\n", input_devs->dev[0]->name,
(input_devs->count > 1) ? "..." : "",
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:
;
}
err_bad_keymap:
kfree(kp);
err_kp_alloc_failed:
err_invalid_platform_data:
return err;
}

97
drivers/input/misc/gpio_output.c Normal file
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@ -0,0 +1,97 @@
/* 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 gpio_event_input_devs *input_devs, struct gpio_event_info *info,
void **data, unsigned int dev, 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 (dev == oi->keymap[i].dev && code == oi->keymap[i].code)
gpio_set_value(oi->keymap[i].gpio, value);
return 0;
}
int gpio_event_output_func(
struct gpio_event_input_devs *input_devs, 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++) {
int dev = oi->keymap[i].dev;
if (dev >= input_devs->count) {
pr_err("gpio_event_output_func: bad device "
"index %d >= %d for key code %d\n",
dev, input_devs->count,
oi->keymap[i].code);
ret = -EINVAL;
goto err_bad_keymap;
}
input_set_capability(input_devs->dev[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:
;
}
err_bad_keymap:
return ret;
}

170
include/linux/gpio_event.h Normal file
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/* 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>
struct gpio_event_input_devs {
int count;
struct input_dev *dev[];
};
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 gpio_event_input_devs *input_devs,
struct gpio_event_info *info,
void **data, int func);
int (*event)(struct gpio_event_input_devs *input_devs,
struct gpio_event_info *info,
void **data, unsigned int dev, unsigned int type,
unsigned int code, int value); /* out events */
bool no_suspend;
};
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);
const char *names[]; /* If name is NULL, names contain a NULL */
/* terminated list of input devices to create */
};
#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,
};
#define MATRIX_CODE_BITS (10)
#define MATRIX_KEY_MASK ((1U << MATRIX_CODE_BITS) - 1)
#define MATRIX_KEY(dev, code) \
(((dev) << MATRIX_CODE_BITS) | (code & MATRIX_KEY_MASK))
extern int gpio_event_matrix_func(struct gpio_event_input_devs *input_devs,
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,
GPIOEDF_PRINT_KEY_UNSTABLE = 1U << 10,
};
struct gpio_event_direct_entry {
uint32_t gpio:16;
uint32_t code:10;
uint32_t dev:6;
};
/* inputs */
extern int gpio_event_input_func(struct gpio_event_input_devs *input_devs,
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 gpio_event_input_devs *input_devs,
struct gpio_event_info *info, void **data, int func);
extern int gpio_event_output_event(struct gpio_event_input_devs *input_devs,
struct gpio_event_info *info, void **data,
unsigned int dev, 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 gpio_event_input_devs *input_devs,
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; /* number of gpios for this axis */
uint8_t dev; /* device index when using multiple input devices */
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